To add to that "Intestinal 5-HT has been found to modulate enteric nervous system (ENS) development and neurogenesis, motility, secretion, inflammation, sensation, and epithelial development." ( Terry 2017 ) 5-HT is made from tryptophan, an essential amino acid
Membrilla JA, Caronna E, Trigo-Lpez J, et al
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Natural supplements usually take longer to show effects
Ipamorelin and GHRP-6 increase bone mineral content in adult rats as measured by DXA (Svensson et al., 2000)