This product is a light, water-based scalp tonic, not a dense serum, oil or hair mask. That makes it a reasonable choice for people who dislike heavy products at the roots or whose hair loses volume easily. It is meant to be massaged into the scalp and left on, and the source description specifically notes that it spreads easily and does not leave a heavy finish.
For oily or fine hair, application technique is important. Use it mainly on the scalp in sections instead of pouring it through the hair lengths. If too much liquid gets onto the hair shaft, the hair may simply feel wet until it dries, even though the formula itself is not described as greasy. Applying after washing can be useful because the scalp is clean and product build-up is lower, but it can also be used as a targeted root step when it suits your routine.
It is not intended to replace shampoo, scalp hygiene or a balanced routine. If your roots become greasy very quickly, consider whether cleansing frequency, styling residue, hats, sweat or heavy leave-in products are contributing. ESVITSIN is best viewed as a simple scalp-focused cosmetic step for supporting a fresher, more cared-for scalp feel and stronger-looking hair, rather than as a styling product for volume or texture.