So far we’ve seen that glycine or collagen supplements can improve sleep, tendon health, and blood sugar. But many of you have asked me, should we be concerned that they can raise oxalate levels? This could potentially increase the risk of kidney stones.

There’s about a ten percent chance you could be at risk of a kidney stone some day, and if you’re in that minority you should be concerned about your exposure to oxalates. Glycine is very unlikely to generate oxalates, but collagen may, especially if you are deficient in vitamin B6. In this video, I describe how to figure out if this is relevant to you and what to do about it.

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