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"Some people are sensitive to the free glutamic acid in collagen protein and may find they get mild headaches or have difficulty sleeping when they consume too much or take collagen too close to bedtime," says registered dietitian Pamela Schoenfeld, MS RD LDN
People with active cancer should be especially cautious
Oxid Med Cell Longev (2021) 2021:1394486
Taking cyanocobalamin when methylcobalamin is available not dangerous, but suboptimal
Glutathione is widely found in animals and plants, and the contents of the bread yeast, wheat germ and animal liver are very high,100~100 mg/1000 g;Content is also rich in human and animal blood, such as human blood contains 26~34 mg/100 g, chicken blood contains 58-73 mg/73 g, pig blood contains 10~15 mg/100 g, the dog blood contains 14~22 mg/100 g.Many vegetables, potato and corn also contains GSH (see table 1)
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