The Ordinary Niacinamide 10% + Zinc 1%

In terms of formula, this serum had a few hits and misses. The runny consistency feels weightless on skin and glides across the face easily. Since the serum is clear in colour, it dries down invisibly. However, it leaves behind a tacky film. As with the Hyaluronic Acid serum , I found that applying it on damp skin goes a long way in dealing with the stickiness. 3-4 drops are sufficient to cover my entire face. Whilst the serum does not have any added fragrances, it still has a distinct, plastic-like scent to it.