Hey, I'm new here. Decided to post this brand-new research about spermidine. Spermidine Promotes Human Hair Growth and Is a Novel Modulator of Human Epithelial Stem Cell Functions Full article: http://www.plosone.org/article/info:doi/10.1371/journal.pone.0022564 TLDR, ...our current data suggest that human HF epithelial stem cells are profoundly modulated by spermidine... Specifically, we demonstrate that spermidine stimulates hair shaft elongation, accompanied by prolongation of anagen, and thus directly promotes human HF growth...topical or nutraceutical spermidine application may reduce telogen effluvium in patients that suffer from hair loss due to premature anagen termination (e.g. by androgens, perifollicular inflammation, iron or estrogen deficiency, or effluvium-inducing drugs)... Spermidine is found in semen and grapefruit according to Wikipedia.