Plants contain no collagen, so vegan collagen supplements are cofactor blends. Which ingredients have real biochemistry behind them, and which do not.
Women's Health
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Soy Isoflavones and Menopause: Why the Research Disagrees With Itself
Only 20-30% of Western adults can convert soy into equol. That single fact explains why isoflavone trials for menopause keep contradicting each other.