Niacinamide from the ordinary contains zinc, an ingredient that can help to control oil production.
While the other two product, the inkey list and the rurubrand contains ingredients that can hydrate and moisturize your skin. But this two serum have different hero ingredients.
For example in the inkey list, it contains allantoin that can moisturize and soothe your skin. It also can heal the wound. The inkey list also contains panthenol that have anti-inflammatory properties that can calmdown the redness on the face. This serum also contains hyaluronic acid.
While the rurubrand contains greentea leaf extract and licorice root extract. We all know that greentea can also help with acne. And licorice root extract are known for it benefit to brighten the skin. This serum also contains glycerin that can moisturize your skin really well. Not only that, it also contains panthenol.
This three serum have different hero ingredients that focus on different things. You can choose one that most suitable with your skin concern and what are you looking in a product^^