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Description
They mention quality testing on their site, sure

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Reported stinging true but exaggerated & I am not good w/needles

A2M binds to and inactivates the destructive enzymes that break down cartilage, helping to slow joint degeneration, relieve pain, and protect against further damage from osteoarthritis

This work was supported by the Swiss National Science Foundation (AMBIZIONE grant PZ00P3_179916 and the NCCR Kidney.CH junior grant to S.N.K.)