Plants contain no collagen, so vegan collagen supplements are cofactor blends. Which ingredients have real biochemistry behind them, and which do not.
vitamin C
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Vitamin C and Quercetin: What the Evidence Actually Says About Immune Support
Vitamin C won't stop you catching a cold, but timing changes everything. NIH-backed dosages, what the common cold research really shows, and how quercetin phytosome fits in.