Part I · Healthy skin
Ingredients Worth Your Money
The actives with real evidence, from niacinamide and acids to ceramides and tranexamic acid.
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Once you've got the five basics down, you can start thinking about adding ingredients that target specific concerns. This is where skincare gets fun, because you can actually see results when you match the right ingredient to the right problem.
I'm going to walk you through the actives that genuinely deliver. These have been studied. They have mechanisms of action that we understand. They show up in dermatology offices for a reason. If you're going to spend money beyond the basics, spend it here.
A note before we start. You don't need all of these. You need the ones that match what your skin is actually dealing with. Adding seven new actives at once is how you wreck your barrier and convince yourself nothing works. Pick one or two that address your top concern, add them slowly, give them three months, and then reassess.
Niacinamide
Niacinamide is vitamin B3, and it's one of the most useful ingredients in modern skincare. It does so many things that it sometimes feels too good to be true, but the research holds up.
It strengthens your skin barrier by helping your skin produce more ceramides. It regulates oil production, which makes it useful for both oily skin (less shine) and acne-prone skin (fewer clogged pores). It reduces redness and inflammation, so it's helpful for rosacea, post-acne marks, and general sensitivity. It also has a brightening effect over time, fading pigmentation by interfering with how pigment transfers within the skin.
The typical effective range is between two and ten percent. Higher than ten percent doesn't seem to add much benefit and can occasionally cause flushing in sensitive skin. The Ordinary's Niacinamide 10% + Zinc 1% is a popular cheap option, but I find five percent works just as well for most people without the occasional irritation.
Niacinamide plays well with almost everything. You can use it with vitamin C, with retinoids, with acids. The old advice not to mix niacinamide with vitamin C has been debunked. They work fine together. If you want to keep them separate just to be tidy, fine, but it's not necessary.
Who should consider it: anyone with oily skin, acne-prone skin, rosacea, hyperpigmentation, sensitive skin, or a compromised barrier. Which is to say, most people.
Hyaluronic Acid
Hyaluronic acid is a humectant, which means it pulls water into your skin. Your body actually makes it naturally, and it's one of the substances that gives young skin its plumpness. Production declines with age.
Topical hyaluronic acid doesn't replace what your skin has lost (the molecule is too big to penetrate deeply), but it does an excellent job of hydrating the surface and the upper layers. Skin that's well-hydrated looks plumper, feels softer, and shows fewer fine lines.
The catch with hyaluronic acid is that it pulls water from wherever it can get it. In humid environments, it pulls moisture from the air. In dry environments, if you apply it to dry skin, it can actually pull water out of deeper layers of your skin, making you feel drier rather than more hydrated. The fix is simple. Apply hyaluronic acid to damp skin, and always seal it in with a moisturizer on top.
Different molecular weights of hyaluronic acid work at different depths. Multi-weight formulas are more effective than single-weight ones. The Ordinary, La Roche-Posay, and SkinCeuticals all make solid options.
Who should consider it: anyone with dehydrated skin, which is most people at some point. Especially useful in dry climates, in winter, after travel, or as you get older and natural production drops.