Yes—use smaller amounts and focus on parts/thinning areas. Avoid layering heavy oils on top.

A mild tingle can happen depending on ingredients, but burning, rash, or persistent irritation is not normal—stop use and consult a professional.

Yes, but apply serum first, let it absorb, then use oil sparingly (if your scalp tolerates oil).

Many serums work best on a dry or slightly damp scalp. Follow your product instructions, but avoid dripping-wet application unless directed.