Can this serum help with frizzy, dull hair or dry ends, and how soon will I notice a difference? — The Doctor. Hair Serum with Panthenol and Apple Vinegar Reconstruction, 89 ml

Yes, this serum is intended for hair that feels weakened, rough or dull after frequent heat styling, colouring, or exposure to dry air and weather changes. It contains two active ingredients with different roles. Panthenol, also known as provitamin B5, binds water well, so it helps the scalp hold moisture more effectively and makes the hair fibre feel less dry and brittle. This supports softness and reduces that rough, thirsty sensation in the lengths. Apple vinegar works on the surface of the hair: it helps the outer cuticle lie flatter, which means strands reflect light better and feel less coarse. A smoother cuticle also makes hair easier to comb and gives the lengths a more polished look. However, this is a cosmetic step for ongoing moisture and surface care rather than an instant fix. You may feel a difference in softness right after the first use, especially if the hair was quite dry. The smoothing and shine effects tend to appear with regular use because a flatter cuticle is a gradual surface change, not a one-time event. Use the serum consistently after washing, and continue with your usual conditioner or a weekly mask if you need deeper conditioning — this product is not a replacement for those steps, but an additional layer for daily hydration and smoothness. Individual results will vary depending on your hair porosity, how much product you use, and the condition of your hair at the start.