The Science Behind Every Ingredient
Understand what your skincare ingredients actually do, how they work, what the evidence supports — and where that evidence is thinner than the marketing suggests.
An ingredient name alone doesn't tell you whether a product will work
Two products can list "niacinamide" and behave completely differently on skin. What actually determines whether an ingredient does anything useful is a combination of factors that never show up on the front of the bottle.
This page exists to make that reasoning visible. For every ingredient below, we've tried to separate what's well established from what's still emerging.
Concentration
Too low and it does little; too high and irritation risk can rise without added benefit.
Formulation & pH
Some actives only work within a narrow pH window — get it wrong and the ingredient can't do its job.
Stability
Some actives degrade in light, air, or heat — a discoloured product may no longer work as tested.
Delivery
Molecular size and vehicle affect whether an ingredient reaches where it needs to act.
Evidence
The quality and volume of research behind an ingredient varies enormously — we grade it honestly below.
Skin compatibility
What suits one skin type or tone can irritate another.
The Ingredient Library
Search by name, or filter by what you're trying to address. Select any card to see the full profile.
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The Ingredients UFormula Builds Around Most
Select any card to see the full evidence-based profile.
What to expect, and when
Skin cell turnover is roughly 28 days in adults — meaningful visible change from most well-formulated actives typically takes at least one full cycle.
Adjustment
Skin acclimatises to new actives. Mild dryness or tingling is common. Hydration is the first improvement.
First signals
Texture starts to smooth. Congestion clears as turnover normalises.
Visible change
Pigmentation begins to fade. Fine lines and pore appearance improve.
Structural results
Collagen-supporting actives show measurable firmness and tone improvements. Consistency is the multiplier.
How to read an ingredient profile
Every ingredient in the library opens into the same standardised profile.
What it is & how it works
The chemistry and biological mechanism, in plain language.
Evidence grade
Strong, Good, Moderate, or Emerging — with the reasoning.
Concentration
What's been studied versus typical cosmetic use.
Compatibility & cautions
What pairs well, what to separate, and who should be careful.
Why "how much" changes everything
Higher concentration is not automatically better.
| Ingredient | Studied range | Typical cosmetic use | What changes with concentration |
|---|---|---|---|
| Niacinamide | 2–5% | 2–10% | Barrier effects seen from 2%; higher isn't shown to add proportional benefit. |
| Vitamin C (L-AA) | 10–20%, pH <3.5 | 10–20% | Below ~10%, collagen effects weaken; above ~20%, absorption plateaus. |
| Retinol | 0.01–1% | 0.1–0.5% | Efficacy rises with concentration, but so does irritation. |
| Azelaic acid | 10–20% | 10% (cosmetic), 15–20% (Rx) | 15% and 20% are the best-studied strengths. |
| Alpha arbutin | 1–2% | 1–2% | EU SCCS caps facial-cream use around 2%. |
| Salicylic acid | 0.5–2% | 0.5–2% | OTC concentrations are capped by regulation. |
| Bakuchiol | 0.5–1% | 0.5–1% | Studied head-to-head with retinol at 0.5% with comparable outcomes. |
| Hyaluronic acid | 0.1–2% | 0.1–2% | Molecular weight matters more than percentage. |
The right concentration is ingredient-specific.
Ingredient Compatibility
Some classic "never combine" rules are outdated. Here's what current evidence actually supports.
Niacinamide
Retinol / Retinal
Vitamin C (L-AA)
AHAs
Azelaic acid
Bakuchiol
Build a Smarter Routine
This is about the logic of layering, not a prescribed routine.
Cleanser
Removes the day's buildup without stripping the barrier.
Treatment
Actives like vitamin C, niacinamide, acids, or retinoids.
Hydration
Humectants like hyaluronic acid, applied to slightly damp skin.
Moisturiser
Ceramides and barrier lipids to seal everything in.
SPF (AM only)
Protects the effort of every step before it.
Morning logic
Mornings favour antioxidants and protection: vitamin C for defence, niacinamide for barrier, SPF as the non-negotiable final step.
Evening logic
Evenings suit actives that need to work without UV interference — retinoids and exfoliating acids.
Ingredient Myths
Select a card to see what the evidence actually says.
The ingredient list is the start of the story, not the end
The same active can perform very differently depending on how it's built into a product.
Concentration
Whether there's enough of the active to do anything measurable.
pH
Determines whether pH-dependent actives can penetrate.
Vehicle & delivery
The base a formula is built in affects how an active reaches skin.
Stability
Light, air, and heat degrade some actives well before the jar is empty.
Ingredient interactions
What else is in the formula can help or undermine the star ingredient.
Skin context
Barrier health, skin tone, and frequency all change the outcome.
How UFormula Evaluates an Ingredient
Every ingredient is weighed against the same set of questions before it earns a place in a formula.
Evidence
What does the research actually show, and how strong is it?
Effective concentration
Is it dosed at a level the evidence supports?
Ingredient quality
Sourcing and grade, not just the name on the label.
Formulation compatibility
Does it work with everything else in the formula?
Stability
Will it still be active by the time it's used?
Skin tolerance
Is it appropriate for the skin types the formula is built for?
Considerations for Indian Skin
Many people with deeper Fitzpatrick skin types (III–VI) have melanocytes that react more readily to inflammation, which is why post-inflammatory hyperpigmentation and melasma come up so often. Combined with India's high year-round UV index, daily broad-spectrum sunscreen matters here more than almost any single active.
Mandelic acid is generally preferred over glycolic acid for deeper skin tones. Alpha arbutin, niacinamide, azelaic acid, and tranexamic acid are commonly reached for pigmentation concerns.
References
This list covers page-level claims. Each ingredient's own supporting studies are inside its profile.
- Draelos ZD, et al. The effect of 2% niacinamide on facial sebum production. J Cosmet Laser Ther. 2006.
- Pinnell SR, et al. Topical L-ascorbic acid: percutaneous absorption studies. Dermatol Surg. 2001.
- King MK, et al. Systematic review of azelaic acid. J Cosmet Dermatol. 2023.
- Dhaliwal S, et al. Prospective, randomized, double-blind assessment of bakuchiol and retinol. Br J Dermatol. 2019.
- Coderch L, et al. Ceramides and skin function. Am J Clin Dermatol. 2003.
- Sarkar R, et al. Comparative study of glycolic, salicylic-mandelic peels. J Cosmet Dermatol. 2019.
- Arif T. Salicylic acid as a peeling agent. Clin Cosmet Investig Dermatol. 2015.
- Passeron T, et al. Sunscreen photoprotection and vitamin D status. Br J Dermatol. 2019.
- Taylor SC. Skin of color: biology, structure, function. J Am Acad Dermatol. 2002.
- Lintner K, Peschard O. Biologically active peptides. Int J Cosmet Sci. 2000.
