Q: Is it irritating?
Generally low-irritation but may tingling due to spicules. Clinically tested by P&K Skin Research Center .
Q: Can I layer it?
Yes—it’s Step Zero; ideal before toner/essence. Suitable for all skin types, including sensitive .
Q: Frequency?
Use nightly or daily; scale back if irritation occurs.
Q: Does it leave residue?
No—it absorbs cleanly with no stickiness