It works well on oily, acne-prone, and dry skin
Glutathione is a small protein molecule (a tripeptide) made of three amino acids: glutamine, glycine, and cysteine
A review summarizes similar effects across mice and cashmere goats (Dai et al., 2021, DOI), and one study tested thymic peptides on cultured human hair follicles (Meier et al., 2012, DOI)
The latter can be obtained as pure crystals from the mucus by extraction with dichloromethane and subsequent chromatographic purification with a 4:1 toluene-ethyl acetate mixture
ClinicalTrials.gov search for the KLOW blend (GHK-Cu + BPC-157 + TB-500 + KPV) returns no registered clinical trial (evidence-gap note
(I need a shrug emoji here) Its really annoying that it isnt always consistently labeled the same way