Supplemental Prospectus - Form 424B3

As filed Pursuant to Rule 424(b)(3)

Registration No. 333-281909

PROSPECTUS

Revelation Biosciences, Inc.

5,096,120 Shares of Common Stock

This prospectus relates to the resale, from time to time, of up to 5,096,120 shares of common stock, par value $0.001 per share, by the selling stockholders identified in this prospectus under "Selling Stockholders" (the "Selling Stockholders") to be issued upon the exercise of common stock purchase warrants (the "Class E Common Stock Warrants") pursuant to an inducement offer letter agreement the Company entered into with the Selling Stockholders on August 21, 2024 (the "Inducement Letter"). The Class E Common Stock Warrants are exercisable until August 22, 2029 at an exercise price of $1.00 per share. We are not selling any shares of common stock under this prospectus and will not receive any proceeds from the sale of the shares of common stock. We may, however, receive proceeds from any warrants that are exercised through the payment of the exercise price in cash, in a maximum amount of up to approximately $5,096,120. We are paying however all of the fees and expenses in connection with the registration of the shares of common stock.

Our common stock is listed on the Nasdaq Capital Market under the symbol "REVB." On August 29, 2024, the last reported sale price of our common stock on the Nasdaq Capital Market was $1.01.

Investing in our securities involves a high degree of risk. You should carefully consider the risk factors incorporated by reference from our filings with the Securities and Exchange Commission under the Securities Exchange Act of 1934, as amended, including particularly the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2023, before you invest in our securities.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined if this prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

The date of this prospectus is September 12, 2024

TABLE OF CONTENTS

ABOUT THIS PROSPECTUS

This prospectus is part of a registration statement on Form S-3 that we filed with the U.S. Securities and Exchange Commission (the "SEC"). You should read this prospectus and the information and documents incorporated by reference carefully. Such documents contain important information you should consider when making your investment decision. See "Where You Can Find More Information" on page 11 and "Incorporation of Certain Information by Reference" on page 12 in this prospectus.

This prospectus may be supplemented from time to time to add, to update or change information in this prospectus. Any statement contained in this prospectus will be deemed to be modified or superseded for purposes of this prospectus to the extent that a statement contained in a prospectus supplement modifies or supersedes such statement. Any statement so modified will be deemed to constitute a part of this prospectus only as so modified, and any statement so superseded will be deemed not to constitute a part of this prospectus. You may only rely on the information contained in this prospectus or that we have referred you to. We have not authorized anyone to provide you with different information. This prospectus does not constitute an offer to sell or a solicitation of an offer to buy any securities other than the securities offered by this prospectus. This prospectus and any future prospectus supplement do not constitute an offer to sell or a solicitation of an offer to buy any securities in any circumstances in which such offer or solicitation is unlawful. Neither the delivery of this prospectus or any prospectus supplement nor any sale made hereunder shall, under any circumstances, create any implication that there has been no change in our affairs since the date of this prospectus or such prospectus supplement or that the information contained by reference to this prospectus or any prospectus supplement is correct as of any time after its date.

This prospectus contains summaries of certain provisions contained in some of the documents described herein, but reference is made to the actual documents for complete information. All of the summaries are qualified in their entirety by the actual documents. Copies of some of the documents referred to herein have been filed, will be filed or will be incorporated by reference as exhibits to the registration statement of which this prospectus is a part, and you may obtain copies of those documents as described below under "Where You Can Find More Information."

The Selling Stockholders are offering the shares of common stock only in jurisdictions where such offer is permitted. The distribution of this prospectus and the sale of the shares of common stock in certain jurisdictions may be restricted by law. Persons outside the United States who come into possession of this prospectus must inform themselves about, and observe any restrictions relating to, the distribution of this prospectus and the sale of the shares of common stock outside the United States. This prospectus does not constitute, and may not be used in connection with, an offer to sell, or a solicitation of an offer to buy, the shares of common stock by any person in any jurisdiction in which it is unlawful for such person to make such an offer or solicitation. If there is any inconsistency between the information in this prospectus and the applicable prospectus supplement, you should rely on the prospectus supplement. Before purchasing any securities, you should carefully read both this prospectus and the applicable prospectus supplement, together with the additional information described under the heading "Where You Can Find More Information; Incorporation of Certain Information by Reference."

When we refer to "Revelation," "REVB," "we," "our," "us" and the "Company" in this prospectus, we mean Revelation Biosciences, Inc. and its subsidiary, unless otherwise specified. When we refer to "you," we mean the holders of the applicable series of securities.

SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS

This prospectus contains forward-looking statements as defined in the Private Securities Litigation Reform Act of 1995, as amended. Forward-looking statements are statements that are not historical facts. These forward-looking statements are generally identified by the words "anticipate", "believe", "expect", "estimate", "plan", "outlook", and "project" and other similar expressions. We caution investors that forward-looking statements are based on management's expectations and are only predictions or statements of current expectations and involve known and unknown risks, uncertainties and other factors that may cause actual results to be materially different from those anticipated by the forward-looking statements. Revelation cautions readers not to place undue reliance on any such forward-looking statements, which speak only as of the date they were made. The following factors, among others, could cause actual results to differ materially from those described in these forward-looking statements: the ability of Revelation to meet its financial and strategic goals, due to, among other things, competition; the ability of Revelation to grow and manage growth profitability and retain its key employees; the possibility that the Revelation may be adversely affected by other economic, business, and/or competitive factors; risks relating to the successful development of Revelation's product candidates; the ability to successfully complete planned clinical studies of its product candidates; the risk that we may not fully enroll our clinical studies or enrollment will take longer than expected; risks relating to the occurrence of adverse safety events and/or unexpected concerns that may arise from data or analysis from our clinical studies; changes in applicable laws or regulations; expected initiation of the clinical studies, the timing of clinical data; the outcome of the clinical data, including whether the results of such study is positive or whether it can be replicated; the outcome of data collected, including whether the results of such data and/or correlation can be replicated; the timing, costs, conduct and outcome of our other clinical studies; the anticipated treatment of future clinical data by the FDA, the EMA or other regulatory authorities, including whether such data will be sufficient for approval; the success of future development activities for its product candidates; potential indications for which product candidates may be developed; the potential impact that global health crises may have on Revelation's suppliers, vendors, regulatory agencies, employees and the global economy as a whole; the ability of Revelation to maintain the listing of its securities on The Nasdaq Stock Market, LLC ("Nasdaq"); the expected duration over which Revelation's balances will fund its operations; and other risks and uncertainties described herein, as well as those risks and uncertainties discussed from time to time in other reports and other public filings with the SEC by Revelation.

RISK FACTORS

We are a development-stage company and we have not yet generated significant revenues. Before making an investment decision, you should carefully consider the risks described in the sections entitled "Risk Factors" in our most recent Annual Report on Form 10-K and subsequent Quarterly Reports on form 10-Q, as filed with the SEC, which are incorporated herein by reference in their entirety, as well as any amendment or updates to our risk factors reflected in subsequent filings with the SEC, including the applicable prospectus supplement. Our business, financial condition or results of operations could be materially adversely affected by any of these risks. The trading price of our securities could decline due to any of these risks, and you may lose all or part of your investment. This prospectus and the incorporated documents also contain forward-looking statements that involve risks and uncertainties. Our actual results could differ materially from those anticipated in these forward-looking statements as a result of certain factors, including the risks mentioned elsewhere in this prospectus.

USE OF PROCEEDS

We are not selling any securities in this prospectus. All proceeds from the resale of the shares of common stock offered by this prospectus will belong to the Selling Stockholders. We will not receive any proceeds from the resale of the shares of common stock by the Selling Stockholders. We may receive proceeds from the cash exercise of the Class E Common Stock Warrants, which, if exercised in cash at the current exercise price with respect to all 5,096,120 shares of common stock, would result in gross proceeds of approximately $5,096,120 to us.

PRIVATE PLACEMENT OF WARRANTS

On August 21, 2024, the Company entered into the Inducement Letters with the Selling Stockholders, who held 2,548,060 existing common stock purchase warrants issued on February 5, 2024 and had an exercise price of $2.39 per share (the "Class D Common Stock Warrants"). Pursuant to the Inducement Letters, the Selling Stockholders agreed to the immediate cash exercise of their Class D Common Stock Warrants to purchase an aggregate of 2,548,060 shares of the Company's common stock at a reduced exercise price of $1.50 per share, and the Company's agreement to issue 5,096,120 Class E Common Stock Warrants, as described below, to purchase, in the aggregate, up to 5,096,120 shares of the Company's common stock. The Company received aggregate gross proceeds of $3,822,090 from the exercise of the Class D Common Stock Warrants by the Selling Stockholders. Prior to the foregoing transaction, the Company had 1,643,395 shares of common stock outstanding.

Each Class E Common Stock Warrant has an exercise price equal to $1.00 per share. The Class E Common Stock Warrants are exercisable from August 22, 2024 until August 22, 2029. The exercise price and number of shares of common stock issuable upon exercise is subject to appropriate adjustment in the event of stock dividends, stock splits, subsequent rights offerings, pro rata distributions, reorganizations, or similar events affecting the Company's common stock and the exercise price.

The Class E Common Stock Warrants are exercisable, at the option of each holder, in whole or in part, by delivering to the Company a duly executed exercise notice accompanied by payment in full, within one trading day of such exercise of the Class E Common Stock Warrant, for the number of shares of the Company's common stock purchased upon such exercise. A holder (together with its affiliates) may not exercise any portion of such holder's Class E Common Stock Warrants to the extent that the holder would own more than 4.99% (or, at the election of the holder, 9.99%) of the outstanding common stock immediately after exercise, except that upon prior notice from the holder to the Company, the holder may increase or decrease the amount of ownership of outstanding stock after exercising the holder's Class E Common Stock Warrants up to 9.99% of the number of shares of the Company's common stock outstanding immediately after giving effect to the exercise, as such percentage ownership is determined in accordance with the terms of the Class E Common Stock Warrants, provided that any increase will not be effective until 61 days following notice to us.

There is no established trading market for the Class E Common Stock Warrants, and the Company does not expect an active trading market to develop. The Company does not intend to apply to list the Class E Common Stock Warrants on any securities exchange or other trading market. Without a trading market, the liquidity of the Class E Common Stock Warrants will be extremely limited.

Except as otherwise provided in the Class E Common Stock Warrants or by virtue of the holder's ownership of shares of the Company's common stock, such holder of Class E Common Stock Warrants does not have the rights or privileges of a holder of the Company's common stock, including any voting rights, until such holder exercises such holder's Class E Common Stock Warrants. The Class E Common Stock Warrants provide that the holders of the Class E Common Stock Warrants have the right to participate in distributions or dividends paid on the Company's shares of common stock.

If at any time the Class E Common Stock Warrants are outstanding, the Company, either directly or indirectly, in one or more related transactions effects a fundamental transaction (as defined in the Class E Common Stock Warrant), a holder of Class E Common Stock Warrants will be entitled to receive, upon exercise of the Class E Common Stock Warrants, the kind and amount of securities, cash or other property that such holder would have received had they exercised the Class E Common Stock Warrants immediately prior to the fundamental transaction. As an alternative, and at the holder's option in the event of a fundamental transaction, exercisable at the earliest to occur of (i) the public disclosure of any change of control, (ii) the consummation of any change of control, and (iii) the holder first becoming aware of any change of control through the date that is 90 days after the public disclosure of the consummation of such change of control by the Company pursuant to a current report on Form 8-K filed with the SEC, the Company shall purchase the unexercised portion of the Warrant from the holder by paying to the holder an amount of cash equal to the Black Scholes value (as defined in the Class E Common Stock Warrant) of the remaining unexercised portion of the Class E Common Stock Warrant on the date of the consummation of such fundamental transaction.

The Class E Common Stock Warrants may be modified or amended or the provisions of the Class E Common Stock Warrants waived with the Company's and the holder's written consent.

The above disclosure contains only a brief description of the material terms of the Inducement Letter and does not purport to be a complete description of the rights and obligations of the parties thereunder, and such description is qualified in its entirety by reference to the full text of the form of the Inducement Letter, the form of which is attached as Exhibit 10.1 to the Current Report on Form 8-K filed with the SEC on August 26, 2024, and is incorporated herein by reference.

SELLING STOCKHOLDERS

The 5,096,120 shares of common stock being offered by the Selling Stockholders, are the shares of common stock underlining the Class E Common Stock Warrants, issued by the Company to the Selling Stockholders as part of the Inducement Letter which was signed on August 21, 2024. For additional information regarding the issuance of the securities, see "Private Placement of Warrants" above. We are registering the shares of common stock in order to permit the Selling Stockholders to offer the shares for resale from time to time. Except as otherwise described in the footnotes to the table below, neither the Selling Stockholders nor any of the persons that control them has had any material relationships with us or our affiliates within the past three (3) years.

The table below lists the Selling Stockholders and other information regarding the beneficial ownership as determined under Section 13(d) of the Securities Exchange Act of 1934, as amended (and the rules and regulations thereunder) of the shares of common stock held by the Selling Stockholders.

The second column lists the number of shares of common stock beneficially owned by each Selling Stockholder before this offering (including shares which the Selling Stockholder has the right to acquire within 60 days, including upon conversion of any convertible securities).

The third column lists the shares of common stock being offered by this prospectus by each Selling Stockholder.

The fourth and fifth columns list the number of shares of common stock beneficially owned by each Selling Stockholder and their percentage ownership after the offering (including shares which the Selling Stockholder has the right to acquire within 60 days, including upon conversion of any convertible securities), assuming the sale of all of the shares offered by each Selling Stockholder pursuant to this prospectus.

PLAN OF DISTRIBUTION

The Selling Stockholders and any of their pledgees, donees, transferees, assignees or other successors-in-interest may, from time to time, sell, transfer or otherwise dispose of any or all of their shares of common stock or interests in shares of common stock on any stock exchange, market or trading facility on which the shares are traded or in private transactions. These dispositions may be at fixed prices, at prevailing market prices at the time of sale, at prices related to the prevailing market price, at varying prices determined at the time of sale, or at negotiated prices.

The selling securityholders may use one or more of the following methods when disposing of the shares or interests therein:

The Selling Securityholders may also sell shares under Rule 144 or Rule 904 under the Securities Act of 1933 (the "Securities Act"), as amended, if available, or Section 4(a)(1) under the Securities Act, rather than under this prospectus.

Broker-dealers engaged by the Selling Securityholders may arrange for other broker-dealers to participate in sales. Broker-dealers may receive commissions or discounts from the Selling Securityholders (or, if any broker-dealer acts as agent for the purchaser of shares, from the purchaser) in amounts to be negotiated.

The Selling Securityholders may, from time to time, pledge or grant a security interest in some or all of the shares of common stock owned by them and, if they default in the performance of their secured obligations, the pledgees or secured parties may offer and sell shares of common stock from time to time under this prospectus, or under a supplement or amendment to this prospectus under Rule 424(b)(3) or other applicable provision of the Securities Act amending the list of Selling Securityholders to include the pledgee, transferee or other successors in interest as Selling Securityholders under this prospectus.

Upon being notified in writing by a Selling Securityholder that any material arrangement has been entered into with a broker-dealer for the sale of common stock through a block trade, special offering, exchange distribution or secondary distribution or a purchase by a broker or dealer, we will file a supplement to this prospectus, if required, pursuant to Rule424(b) under the Securities Act, disclosing (i) the name of each such Selling Securityholder and of the participating broker-dealer(s), (ii) the number of shares involved, (iii) the price at which such shares of common stock were sold, (iv) the commissions paid or discounts or concessions allowed to such broker-dealer(s), where applicable, (v) that such broker-dealer(s) did not conduct any investigation to verify the information set out or incorporated by reference in this prospectus, and (vi) other facts material to the transaction. In addition, upon being notified in writing by a Selling Securityholder that a donee or pledgee intends to sell more than 500 shares of common stock, we will file a supplement to this prospectus if then required in accordance with applicable securities law.

The Selling Securityholders also may transfer the shares of common stock in other circumstances, in which case the transferees, pledgees or other successors in interest will be the selling beneficial owners for purposes of this prospectus.

In connection with the sale of the shares of common stock or interests in shares of common stock, the Selling Securityholders may enter into hedging transactions with broker-dealers or other financial institutions, which may in turn engage in short sales of the common stock in the course of hedging the positions they assume. The Selling Securityholders may also sell shares of common stock short and deliver these securities to close out their short positions, or loan or pledge the common stock to broker-dealers that in turn may sell these securities. The Selling Securityholders may also enter into option or other transactions with broker-dealers or other financial institutions or the creation of one or more derivative securities which require the delivery to such broker-dealer or other financial institution of shares offered by this prospectus, which shares such broker-dealer or other financial institution may resell pursuant to this prospectus (as supplemented or amended to reflect such transaction).

The Selling Securityholders and any broker-dealers or agents that are involved in selling the shares may be deemed to be "underwriters" within the meaning of the Securities Act in connection with such sales (it being understood that the Selling Securityholders shall not be deemed to be underwriters solely as a result of their participation in this offering). In such event, any profits realized by such Selling Securityholders or compensation received by such broker-dealers or agents may be deemed to be underwriting commissions or discounts under the Securities Act. The maximum commission or discount to be received by any member of the Financial Industry Regulatory Authority (FINRA) or independent broker-dealer will not be greater than 8% of the initial gross proceeds from the sale of any security being sold.

We have advised the Selling Securityholders that they are required to comply with Regulation M promulgated under the Securities Exchange Act of 1934, as amended, during such time as they may be engaged in a distribution of the shares. The foregoing may affect the marketability of the common stock.

The aggregate proceeds to the Selling Securityholders from the sale of the common stock offered by them will be the purchase price of the common stock less discounts or commissions, if any. Each of the Selling Securityholders reserves the right to accept and, together with their agents from time to time, to reject, in whole or in part, any proposed purchase of common stock to be made directly or through agents. We will not receive any of the proceeds from this offering.

We are required to pay all fees and expenses incident to the registration of the shares. We have agreed to indemnify the Selling Securityholders against certain losses, claims, damages and liabilities, including liabilities under the Securities Act or otherwise.

We have agreed with the Selling Securityholders to keep the registration statement of which this prospectus constitutes a part effective until the earliest of (a) the third anniversary of the effective date of the registration statement, (b) such time as all of the shares and the Class E Common Stock Warrant shares covered by this prospectus have been disposed of pursuant to and in accordance with the registration statement and (c) such time as the shares and warrant shares become eligible for resale by non-affiliates without any volume limitations or other restrictions and without the current public information requirement pursuant to Rule 144(b)(1)(i) or any other rule of similar effect.

EXPERTS

The consolidated financial statements of Revelation Biosciences, Inc. as of December 31, 2023 and 2022 and for each of the two years in the period ended December 31, 2023, incorporated in this prospectus by reference from the Company's Annual Report on Form 10-K for the year ended December 31, 2023 have been audited by Baker Tilly US, LLP, an independent registered public accounting firm, as stated in their report thereon (which report includes an explanatory paragraph regarding the existence of substantial doubt about the Company's ability to continue as a going concern), incorporated herein by reference, and have been incorporated in this prospectus and registration statement in reliance upon such report and upon the authority of such firm as experts in accounting and auditing.

LEGAL MATTERS

Certain legal matters, including the validity of the securities offered pursuant to this registration statement, will be passed upon for us by J.P. Galda & Co., Ardmore, Pennsylvania.

WHERE YOU CAN FIND MORE INFORMATION

We must comply with the informational requirements of the Securities Exchange Act of 1934, as amended, and we are required to file reports and proxy statements and other information with the Securities and Exchange Commission. You may read and copy these reports, proxy statements and other information at the Public Reference Room maintained by the Securities and Exchange Commission at 100 F Street, N.E., Washington, D.C. 20549. You may also obtain copies at the prescribed rates from the Public Reference Section of the Securities and Exchange Commission at its principal office in Washington, D.C. You may call the Securities and Exchange Commission at 1-800-SEC-0330 for further information about the public reference room. The Securities and Exchange Commission also maintains a website that contains reports, proxy and information statements and other information regarding issuers like us that file electronically with the Securities and Exchange Commission. You may access the Securities and Exchange Commission's web site at http://www.sec.gov.

Statements contained in this prospectus as to the contents of any contract or other document are not necessarily complete, and in each instance we refer you to the copy of the contract or document filed as an exhibit to the registration statement, each such statement being qualified in all respects by such reference.

INCORPORATION OF CERTAIN INFORMATION BY REFERENCE

The Securities and Exchange Commission allows us to incorporate by reference in this prospectus the information that we file with them. Incorporation by reference means that we can disclose important information to you by referring you to other documents that are legally considered to be part of this prospectus. Later information that we file with the Securities and Exchange Commission will automatically update and supersede the information in this prospectus, any supplement and the documents listed below. We incorporate by reference the specific documents listed below and any future filings made with the Securities and Exchange Commission under Section 13(a), 13(c), 14, or 15(d) of the Securities Exchange Act of 1934, as amended, including those filed after the date of the initial registration statement and prior to the effectiveness of the registration statement, until all of the shares of common stock covered by this prospectus are sold:

We will furnish without charge to each person, including any beneficial owner, to whom this prospectus is delivered, upon written or oral request, a copy of any document incorporated by reference. Requests should be addressed to Corporate Secretary, 4660 La Jolla Village Drive, Suite 100, San Diego, CA 92122 or via telephone at (650) 800-3717.

You should rely only on the information incorporated by reference or provided in this prospectus or any prospectus supplement. We have not authorized anyone to provide you with different information. You should not assume that the information contained in this prospectus or the accompanying prospectus supplement is accurate on any date subsequent to the date set forth on the front of the document or that any information we have incorporated by reference is correct on any date subsequent to the date of the document incorporated by reference, even though this prospectus and any accompanying prospectus supplement is delivered or securities are sold on a later date.

Nothing in this prospectus shall be deemed to incorporate information furnished but not filed with the SEC pursuant to Item 2.02 or 7.01 of Form 8-K.