FORM OF LETTER OF LOCK-UP UNDERTAKING Date: From: (the " Optionee ") To: Regencell Bioscience Holdings Limited (the " Company ") References are made in this third extension of letter of lock-up undertaking (this " Third

FORM OF LETTER OF LOCK-UP UNDERTAKING

References are made in this

third extension of letter of lock-up undertaking (this "Third Extension of Lock-Up Undertaking") to (i) an agreement

of option to purchase ordinary share of Regencell Bioscience Holdings Limited dated , under which the Company granted certain options

(the "Options") to purchase ordinary shares of the Company in the amounts set forth therein; (ii) a letter of lock-up

undertaking by the Optionee dated , under which the Optionee undertook to the Company, within the period of one year and six months

immediately following the closing of the initial public offering of the Company, not to, and to procure any entities controlled by the

Optionee and any trusts of which the Optionee is a beneficiary not to, offer, pledge, sell, contract to sell, sell any option or contract

to purchase, purchase any option or contract to sell, grant any option, right or warrant for the sale of, or otherwise transfer or dispose

of any of the Options or shares issued upon exercise of the Options (the "Lock-Up Undertaking"); (iii) a letter of

lock-up undertaking by the Optionee dated , under which the Optionee undertook to the Company to extend the Lock-Up Undertaking for

an additional six months (the "First Extension of the Lock-Up Undertaking"); and (iv) a letter of lock-up undertaking

by the Optionee dated , under which the Optionee undertook to the Company to extend the Lock-Up Undertaking and the First Extension

of the Lock-Up Undertaking for an additional six months (the "Second Extension of the Lock-Up Undertaking", and together

with the Lock-Up Undertaking and the First Extension of the Lock-Up Undertaking, the "Lock-Up Undertakings").

For good and valuable consideration

received by the Optionee from the Company, the Optionee hereby agrees to enter into this Third Extension of Lock-Up Undertaking to extend

the Lock-Up Undertakings for an additional twelve months until January 20, 2025.

The laws of New York shall govern the interpretation,

validity, administration, enforcement and performance of the terms of this Third Extension of Lock-Up Undertaking regardless of the law

that might be applied under principles of conflicts of laws.

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IN WITNESS WHEREOF, the Optionee has executed this letter agreement

as of the date first set forth above.

Regencell Bioscience Holdings Limited

[Signature Page to the Letter of Lock-up Undertaking]