I took InstaFlex Advanced. My joints felt better. However, I then got serious intestinal cramping, diarrhea, experienced hair loss, sores on skin, and dandruff. This was certainly not for me.
Bottom Line: No, I would not recommend this to a friend
I have had the dermatological effects. I started losing my hair after about a month of therapy. There was some improvement in my knee but I didn't want to become bald, so I stopped. In about two weeks I noticed that I was no longer losing hair. I have discontinued using the product.