Diagnostic Comparison: SH-1 Molecule vs PP405 — Safety Profiles in Hair Science

The document compares the safety profiles of two hair-science molecules: SH‑1, a cosmetic active ingredient, and PP405, an investigational drug candidate. SH‑1 shows zero systemic absorption and maintains epidermal barrier integrity at all dose levels, indicating a strong safety profile for cosmetic use. In contrast, PP405 exhibits dose-dependent systemic uptake, with dermal infiltration and a breach of critical safety thresholds at therapeutic concentrations, highlighting potential risks. This comparison underscores the differences in safety and regulatory considerations between cosmetic and investigational molecules in hair science.