itsOVER
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Evidence: https://www.ncbi.nlm.nih.gov/pubmed/20093739
"Detailed assessment of all possible sources of glycine shows that synthesis from serine accounts for more than 85% of the total, and that the amount of glycine available from synthesis, about 3 g/day, together with that available from the diet, in the range 1.5-3.0 g/day, may fall significantly short of the amount needed for all metabolic uses, including collagen synthesis by about 10 g per day for a 70 kg human. This result supports earlier suggestions in the literature that glycine is a semi-essential amino acid and that it should be taken as a nutritional supplement to guarantee a healthy metabolism. "
Basically, take 10g of glycine a day (if 70kg bodyweight, scale up or down if you're above or below that) to maximise your collagen boyos. It's also very cheap in powder form, so no excuse not to do it really.
"Detailed assessment of all possible sources of glycine shows that synthesis from serine accounts for more than 85% of the total, and that the amount of glycine available from synthesis, about 3 g/day, together with that available from the diet, in the range 1.5-3.0 g/day, may fall significantly short of the amount needed for all metabolic uses, including collagen synthesis by about 10 g per day for a 70 kg human. This result supports earlier suggestions in the literature that glycine is a semi-essential amino acid and that it should be taken as a nutritional supplement to guarantee a healthy metabolism. "
Basically, take 10g of glycine a day (if 70kg bodyweight, scale up or down if you're above or below that) to maximise your collagen boyos. It's also very cheap in powder form, so no excuse not to do it really.