CIV §1694.6: (a) In addition to any other right to revoke an offer, the buyer has the right to cancel a weight loss contract or offer until midnight of the third business day after the day on which the buyer signs

(a) In addition to any other right to revoke an offer, the buyer has the right to cancel a weight loss contract or offer until midnight of the third business day after the day on which the buyer signs an agreement or offer to purchase those services. (b) Cancellation occurs when the buyer gives written notice of cancellation by mail, telegram, or delivery to the seller at the address specified in the agreement or offer. (c) Notice of cancellation, if given by mail, is effective when deposited in the mail properly addressed with postage prepaid. (d) Notice of cancellation given by the buyer need not take the particular form as provided in the contract or offer to purchase and, however expressed, is effective if it indicates the intention of the buyer not to be bound by the weight loss contract. (e) All moneys paid pursuant to any weight loss contract shall be refunded within 10 days of receipt of the notice of cancellation. (f) The buyer may notify the weight loss program of his or her intent to cancel the contract within the three-day period specified in this section and stop the processing of a credit card voucher or check by telephone notification to the weight loss program. However, this does not negate the obligation of the buyer to cancel the contract by mail, telegram, or delivery as required pursuant to this section.