One study found a significant reduction in hair loss over the span of four injection treatments, increasing the hair count from an average of 71 hair follicular units to 93
The human tripeptide GHK-Cu in the prevention of oxidative stress and degenerative conditions of aging
However, there is no evidence that stimulant-based ingredients are effective when delivered through the skin, and it remains unclear whether they can be absorbed in sufficient amounts to produce meaningful effects
doi: 10.1210/jcem.82.5.3943 121 AitmanTJRaffertyBCoyDLynchSSClaytonRN
The main difference is that peptides are shorter strings of amino acids than proteins, although the terms aren't used precisely
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