A collagen protein supplement (amino acid–mostly glycine).
- slim evidence shown to improve skin, hair and nail health
- evidence to help with joint pain
- muscle growth: substrates to produce creatine -> proline helps maintain cell structure and function -> glycine may increase HGH
- increased cognitive function and sleep
corotinoids Retinol (synthetic Vitamin A): good for skin
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egg yolk
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butter
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cod liver oil
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kale
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parsley
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spinach