Secret Clinical Strength Reward Program! Posted on July 28, 2015July 28, 2015 by Rosey Did you know that Secret Clinical Strength has an on-going reward program? Buy (4) products and get (1) coupon good for a free full size product. Details and downloadable form can be found here! Share this:FacebookPinterestTwitterEmailMorePocketRedditTumblr Posted in Coupons.