Active ingredients are the ones that actually create visible changes in your skin. They can fade dark spots, boost collagen, calm inflammation, hydrate, or regulate oil — but only when you use them right.
Below, we'll walk through the five active ingredients that form the backbone of most skincare routines — and help you navigate the world of INCI lists along the way.
Hyaluronic acid (Sodium Hyaluronate)
Moisturizing serums in GrailWhat is it? A natural humectant that binds water molecules in the skin, leaving it plumper and more supple.
What to look out for:- On the INCI list it appears as Sodium Hyaluronate or Hydrolyzed Hyaluronic Acid.
- You'll most often find it in serums at higher concentrations.
- Always follow it with a moisturizer so the water doesn't evaporate from your skin.
Type: humectant, suitable for all skin types.
Niacinamide (Vitamin B3)
What is it? A versatile ingredient that balances how your skin functions: it calms inflammation, controls oil production, and evens out tone.
What to look out for:- Effective concentration: at least 4–5%, so look for it near the top of the INCI list (between positions 2 and 6).
- Irritation is rare, but combining it with other actives (like acids) can sometimes cause discomfort.
- Plays well with vitamin C and hyaluronic acid.
Type: anti-inflammatory, barrier-strengthening, brightening.
Vitamin C (Ascorbic Acid and its derivatives)
Brightening serums in GrailWhat is it? One of the most well-researched antioxidants in skincare. It helps neutralize free radicals, protecting your skin from environmental damage like UV exposure and pollution. It also brightens, evens out tone, and over the long term boosts collagen production — so it has anti-aging benefits, too.
Vitamin C doesn't always show up as Ascorbic Acid on the ingredient list. There are different derivatives, each with its own stability, mechanism, and skin tolerance:
The pure, most potent form. Effective at 10–20% concentration, but unstable — it oxidizes quickly (the serum turns yellow) and requires a low pH that can irritate sensitive skin.
Pro tip: if you spot it near the top of the INCI list with no stabilizer next to it (like Ferulic Acid), pay attention to the shelf life and packaging.
A stable, lipophilic form that can penetrate deeper into the skin. Gentler and less irritating, but still an effective antioxidant and brightener.
A water-soluble form of vitamin C that's gentle on the skin yet can improve tone and support collagen production over time. A great choice for oily, blemish-prone skin too, since it can have antibacterial effects.
A stable vitamin C derivative bonded to a sugar molecule. It activates more slowly, but it's gentler and has a lower risk of irritation. With consistent use, it evens out skin tone.
Another gentle, stable derivative with hydrating and brightening effects. It doesn't penetrate as deeply, but it's well-tolerated on sensitive skin.
- It's photosensitive, so always wear sunscreen with it.
- If you have sensitive skin, go for the gentler derivatives.
- Airless packaging keeps it stable for longer.
Type: antioxidant, brightening, anti-aging.
Retinoids
Anti-aging products in GrailRetinoids are one of the most effective categories in skincare. The group includes classic retinol and its more modern derivatives. They speed up cell turnover, improve skin texture, reduce fine lines and wrinkles, and help fade dark spots and acne scars.
Retinol can show up in several forms on INCI lists, each with different strength, irritation potential, and how quickly it works:
The classic form. Inside the skin, it converts to active retinoic acid through several steps. It's effective but unstable — it breaks down easily in light and air, so the packaging matters a lot. Use carefully on irritation-prone skin.
One step closer to biologically active retinoic acid, so it works faster and stronger than retinol. Effective even at low concentrations, while still less irritating than prescription retinoids.
A modern, stable retinoid that binds directly to retinoid receptors — making it effective but generally better tolerated. A good option for sensitive skin or before stepping up to traditional retinol.
What to keep in mind when choosing a retinol product
Retinoids break down in sunlight and can make your skin more UV-sensitive. Sunscreen during the day is a must — even if you only use retinol at night.
Start with once or twice a week and increase frequency gradually based on how your skin reacts. Going too hard too fast can cause redness, flaking, or burning.
Well-formulated retinol products include ingredients that improve tolerability: Panthenol, Bisabolol, Allantoin, Centella Asiatica, Ceramides.
Retinoids are sensitive to light and air, so airless pump bottles or metal tubes are best. Clear glass and open jars lose effectiveness faster.
Mixing retinol with acids, strong vitamin C, or exfoliants can dial up irritation. Better to use those on alternate evenings.
What to expect from retinol
Retinol isn't a quick fix — it's an investment in your skin's future. You may see some mild peeling or dryness in the first weeks, but after 8–12 weeks of consistent use, your skin's texture smooths out, tone evens up, and fine lines start to soften.
Peptides
What is it? Short chains of amino acids that signal your skin to produce more collagen. They help your skin stay firm.
What to look out for:- On the INCI list, peptides go by many names — e.g. Palmitoyl Tripeptide-1, Matrixyl 3000.
- Especially good for mature, thinner skin.
- Pair well with hyaluronic acid, but avoid using them at the same time as strong acids.
Type: anti-aging, firming.
How to use them wisely
Don't pile too many actives on at once. A skin-friendly routine is built slowly. Keep your skin well-hydrated and pay attention to its signals. If it gets red, tight or flaky, take a rest day.