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Interestingly, in the gut, iron and manganese can influence each others absorption as both metals use the same transporters (88, 92, 93)

Two primary controllers are peptide hormones produced by the brains hypothalamus, growth hormone releasing hormone (GHRH) and somatostatin, which act in a dynamic equilibrium to regulate circulating GH levels: when the hypothalamus detects reduced blood levels of GH, it releases GHRH which stimulates specialized cells in the pituitary to synthesize and secrete GH

[DOI] [PubMed] [Google Scholar] 150.Seidu T.A., Kutoka P.T., Asante D.O., Farooq M.A., Alolga R.N., Bo W

Deeper absorption for maximum impact Hair follicles are located deep beneath the scalp's surface