It is 15 amino acids long, which makes it large enough to have meaningful receptor interactions but small enough to synthesize cost-effectively
Zinc Supports immunity, growth, healing, and hormone function
Oral supplements are inexpensive up front, but because so little of a swallowed dose is absorbed, some of what you buy is not used by your body
For topical or in vivo investigational use, concentrations of 0.05% to 0.1% (w/v) have been employed in wound-healing studies without reported adverse events
Sluggett JK, Koponen M, Simon Bell J, Taipale H, Tanskanen A, Tiihonen J, Uusitupa M, Tolppanen AM, Hartikainen S (2020) Metformin and risk of Alzheimer's disease among community-dwelling people with diabetes:a national case-control study