Plant- or human-derived stem cell extracts (most commonly plant stem cell cultures, not living cells) are marketed in skincare for antioxidant and conditioning effects, often based on growth factors and bioactive compounds in the extract. Clinical evidence for anti-aging benefits is limited and largely preliminary.
| Reported effect | How often | Notes |
|---|---|---|
| Contact irritation (redness, stinging) | Uncommon | More likely from accompanying preservatives or carrier ingredients than the extract itself. |
| Allergic contact dermatitis | Rare | May relate to botanical proteins or formulation components. |
| Acneiform or follicular reactions | Rare | Occasionally reported with rich or occlusive formulations. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.