My husband and I have been using both the collagen and the Protien Shakes for 2 years now. We are both in our 70's and my husband has had work related joint issues. He does resistance training 3 Xper week. Your collagen has made that possible along with your book that was recommended to us from his Physical Therapist after his first knee replacement.I had cadavior knee parts placed in my knee over 50 years agp. I was told they would have to be replaced. Still got them. Still running . Still working a very physical job. Leg pressing 300 lbs. Keep up the good product.
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