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This includes vegans and vegetarians, older adults, individuals with atrophic gastritis, pernicious anemia, gastrointestinal disorders, those who have had gastrointestinal surgery and people who take certain medications including, but not limited to, estrogen (HRT), and birth control pills

While GH deficiency can cause hair problems, supplementing GH in normal individuals does not reliably improve hair growth

Any discussion of biological activity refers solely to laboratory, in vitro, or preclinical research

if you don't have one, a sturdy plastic jug with a screw-on lid (an empty laundry detergent bottle is the classic example) will do in a pinch