California Code, Civil Code - CIV § 1694.7

(a) A weight loss contract shall be in writing. A copy of the contract shall be provided to the buyer at the time he or she signs the contract.

(b) Every weight loss contract shall contain on its face, and in close proximity to the space reserved for the signature of the buyer, a conspicuous statement in a size equal to at least 10-point boldface type, as follows:

“You, the buyer, may cancel this agreement, without any penalty or obligation, at any time prior to midnight of the original contract seller's third business day following the date of this contract, excluding Sundays and holidays. To cancel this agreement, mail or deliver a signed and dated notice, or send a telegram which states that you, the buyer, are canceling this agreement, or words of similar effect. This notice shall be sent to:

(c) The weight loss contract shall contain on the first page, in a type size no smaller than that generally used in the body of the document, the name and address of the weight loss program operator to which the notice of cancellation is to be mailed; and the date the buyer signed the contract.

(d) No weight loss contract shall require payments or financing by the buyer over a period in excess of two years from the date the contract is entered into, nor shall the term of any such contract be measured by the life of the buyer. The services to be rendered to the buyer under the contract shall not extend for more than three years after the date the contract is entered into.

(e) If a weight loss contract is not in compliance with this chapter, the buyer may, at any time, cancel the contract.