What is retinoic acid in skincare?
Retinoic acid is the form of vitamin A that skin cells can actually use. Every other retinoid – retinyl palmitate, retinol, retinaldehyde – is a precursor that the skin must convert into retinoic acid through one or more enzymatic steps before anything happens.
Applied topically as tretinoin it is a prescription medicine, because it bypasses conversion entirely and binds straight to retinoic acid receptors in the cell nucleus.
What skin concerns does retinoic acid treat?
By binding those receptors it changes gene expression: keratinocytes mature and shed normally, sebaceous activity drops, melanin distribution evens out, and dermal fibroblasts produce more collagen.
That translates to measurable improvement in acne, fine lines, wrinkles, rough texture, enlarged pores and mottled pigmentation – the widest evidence base of any topical active.
What ingredients are best paired with retinoic acid?
Because it is the most potent form, barrier support matters most: ceramides, hyaluronic acid, niacinamide, panthenol and squalane. Build up slowly rather than pushing through irritation.
Keep it to night use, apply broad-spectrum SPF every morning, and avoid layering with AHAs, BHAs or benzoyl peroxide in the same step. It is contraindicated in pregnancy. If your skin cannot tolerate it, retinaldehyde or a well-formulated retinol is the sensible step down. Take our Skin Quiz.
What is redness?
Facial redness is visible dilation of the small blood vessels near the skin’s surface. It ranges from transient flushing that comes and goes, to persistent erythema across the cheeks and nose, to fixed thread veins that stay visible all the time.
Redness is a symptom rather than a diagnosis. It can signal rosacea, irritation, an over-exfoliated barrier, eczema, an allergic reaction or simply reactive skin that responds strongly to heat and stress.
What causes redness?
Most persistent redness traces back to a compromised barrier and heightened nerve sensitivity. When the barrier thins, irritants penetrate more easily and the skin mounts an inflammatory response to things it would normally tolerate.
Common aggravators: over-exfoliation, high-strength actives used too often, fragrance and essential oils, hot water, alcohol, spicy food, sudden temperature change, sun exposure and stress. Trying to treat redness with more actives usually deepens it.
What ingredients are best for redness?
Prioritise calming and rebuilding over correcting. Niacinamide, azelaic acid, centella asiatica, green tea extract, liquorice root, allantoin, bisabolol and colloidal oatmeal all reduce visible inflammation.
Then repair the barrier with ceramides, cholesterol, fatty acids, glycerin, panthenol and squalane, and protect it with a gentle mineral SPF. Strip the routine back to cleanser, moisturiser and sunscreen for a few weeks before reintroducing anything active. Take our Skin Quiz.
