We are your Joint Health Experts.

KaufmanLet Doug Kaufmann from Know the Cause fill you in on the amazing effects of our joint supplements.

First Time Customers


Flexcin Starter Pack:


Reg Price
Now $40 OFF

Ready to Start?

Try a 90 day supply of Flexcin

If you’re not satisfied return the empty bottles for a
full refund, less shipping and handling.


NO MORE KNEE PAIN FOR THIS ROLLER DERBY QUEEN... I play roller derby and I hurt my knee. I lost complete range of motion. I noticed twinges and pains in my knees and hips that I just thought I had to deal with but now they’re completely gone with Flexcin. After about three weeks or so I really got a lot of my range of motion back and after six weeks I could completely squat down with no pain at all.

Choose one of our Joint Supplements