Will this serum make my hair greasy or heavy? — The Doctor. Hair Serum with Panthenol and Apple Vinegar Reconstruction, 89 ml

This serum is specifically formulated to be water-based and light, and it is described as sinking in quickly without the oily finish that many hair oils leave behind. That makes it a reasonable choice if you want hydration for the scalp or lengths but dislike the greasy feel of heavy oils. The product works with water-attracting panthenol and smoothing apple vinegar, not with oil-based shine, so the finish is usually more soft and matte than glossy. Greasiness is most often the result of over-application. On fine, short, or low-porosity hair, even a water-based serum can look wet or clumpy if you use too much. So start with a small amount — roughly a hazelnut-sized portion — and rub your hands together before smoothing it over the hair. Focus on the mid-lengths and ends, and only add a little more if your hair clearly needs it. If you have very thick or long hair, you may need a slightly larger amount, but it is still better to build up in two thin layers than to pour on a large quantity at once. This approach keeps the hair feeling light while still giving the moisture and smoothing benefits. To keep the water-based formula stable, store the bottle closed in a cool, dry place away from direct sunlight.