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
Soy isoflavones for menopause and the truth about vegan collagen — what the research supports, where it disagrees with itself, and what it cannot show.
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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.