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In fact, collagen is a primary component of the heart's own structure

Goal: Support cellular energy metabolism, mitochondrial function and DNA-repair pathways by replenishing NAD+ goals pursued in research and wellness, not established for injectable NAD+ in humans [5] [6]

How to Increase Glutathione (GSH) Levels

I follow quite closely the suggested treatment level for B12 deficiency with neurological damage because I dont think the treatment level specified for B12 deficiency with only blood symptoms, which is apparently what you are following, is adequate for achieving my two goals regarding neurological damage