(PubMed) Stewart ZA, Westfall MD, Pietenpol JA
In a randomized, placebo-controlled intervention study with more than 900 older participants experiencing psychological distress, daily supplementation with folic acid (400 g) and vitamin B 12 (100 g) for two years did not reduce the occurrence of symptoms of depression despite significantly improving blood folate, vitamin B 12 , and homocysteine levels compared to placebo (109)
In 1973, Loren Pickart and Margaret Thaler reported that a small factor in human serum could prolong the survival of normal liver cells and modulate growth in liver tissue, and that plasma from younger donors was more active than plasma from older donors
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