Panthenol, a stable form of vitamin B5, draws and holds water in skin and strengthens its protective barrier, calms irritation, and can speed healing of minor and post-procedure wounds. Evidence is strong for hydration and barrier support, but thin or mixed for skin-aging and hair growth. It is low-cost, gentle, and well-tolerated; uncommon delayed skin allergy is the main concern. (Full Review)
| Marker | Target | Why |
|---|---|---|
| Skin patch test (if reaction suspected) | Negative (no delayed reaction) | Confirms or excludes panthenol contact allergy |
| Transepidermal water loss (TEWL) | Lower is better | Objective gauge of barrier improvement |
| Serum pantothenic acid | Within normal reference range | Only relevant with high-dose oral B5, not topical use |
Cadence: Symptom-driven, not scheduled; reassess at roughly 2–4 weeks. Routine repeat testing not needed unless a problem develops.