Why Retinol Causes Irritation — And What Bakuchiol Does Differently

If you have ever started using retinol and found your skin becoming red, dry, flaky or stinging within the first few weeks, you are not doing it wrong. You are experiencing a predictable, documented biological response. Understanding why retinol causes these effects — and the mechanism by which bakuchiol achieves similar results without triggering them — is one of the most useful pieces of skincare knowledge you can have.

The Retinol Conversion Cascade

When you apply retinol to skin, it does not act directly. It must be converted by skin enzymes through a two-step process: first into retinaldehyde, then into retinoic acid, which is the biologically active form that binds to nuclear retinoic acid receptors (RARs) and regulates gene expression. This conversion is what drives retinol's anti-ageing effects.

It is also what drives the irritation. The conversion process, and retinoic acid's subsequent action on skin cells, triggers a rapid increase in skin cell turnover that the skin is not accustomed to. The epidermis begins shedding cells faster than it can replenish its natural lipid barrier, leading to the characteristic dryness, flaking, redness and sensitivity. Some practitioners call this the retinol adjustment period. Dermatologists sometimes call it retinoid dermatitis. Users call it the retinol uglies.

This phase typically lasts 4–8 weeks. Some people never fully acclimatise. For people with compromised skin barriers, rosacea, eczema or chronically sensitive skin, the irritation can be severe enough to make continued use impossible.

Why Bakuchiol Does Not Trigger the Same Response

Bakuchiol is not a retinoid. It has no structural similarity to vitamin A and does not convert to retinoic acid. It does not bind to the same nuclear receptors through the same mechanism. Yet in gene expression studies, it upregulates the same collagen-producing and cell-renewing pathways that retinol activates — through a parallel, distinct signalling route that achieves similar downstream effects without triggering the irritation cascade.

The consequence is straightforward: bakuchiol produces progressive improvement in fine lines, hyperpigmentation and skin firmness — the same outcomes measured in the 2018 British Journal of Dermatology head-to-head study — without the epidermal disruption that retinol's enzymatic conversion causes. There is no adjustment period. There is no purging phase. Bakuchiol-tolerant skin from day one is the norm, not a lucky exception.

The Photostability Advantage

Retinol degrades in ultraviolet light. This is why retinol products are packaged in opaque, light-resistant containers and why dermatologists recommend using retinol only at night, paired with daily SPF application. The photosensitivity issue is real: retinol increases the skin's vulnerability to UV damage during the adjustment period, which is particularly relevant for people using it to address sun-induced hyperpigmentation.

Bakuchiol is photostable. It does not degrade in sunlight and does not increase photosensitivity. It can be used morning and evening without SPF dependency — though daily SPF is recommended regardless of what actives you use, as a baseline skin health practice. The practical benefit is a flexible, twice-daily application schedule that the 2018 study demonstrated produces results equivalent to once-daily retinol.

The Pregnancy and Breastfeeding Question

Retinol is contraindicated during pregnancy. Systemic vitamin A in high doses is a known teratogen, and while the topical absorption of retinol is low, the precautionary recommendation from most dermatologists and obstetricians is to avoid all retinoids during pregnancy and breastfeeding. This leaves anyone pregnant who wants effective anti-ageing or brightening support with a significant gap.

Bakuchiol is not a retinoid and does not carry retinol's teratogenic concerns. It is widely used by people during pregnancy who have confirmed its use with their healthcare provider. The existing clinical evidence does not suggest risk, and its classification as a botanical active rather than a vitamin A derivative places it in a different risk category entirely. That said, the standard guidance applies: consult your healthcare provider before adding any new active ingredient to your routine during pregnancy or breastfeeding.

For Skin That Has Given Up on Retinol

If you have tried retinol — possibly multiple times, with multiple products, at different strengths — and found your skin consistently unable to tolerate it, bakuchiol is not a consolation prize. It is a clinically validated alternative that produces measurably comparable results through a fundamentally different mechanism, with a tolerability profile that makes long-term consistent use achievable where retinol was not.

Consistency is ultimately what produces results in skincare. An active ingredient that you use twice daily for twelve weeks produces better outcomes than a more potent ingredient that your skin forces you to stop after two weeks. For a meaningful portion of the population, bakuchiol is the more effective choice in practice precisely because it is the more tolerable one.

→ Shop the PRANA Bakuchiol Night Restorative Serum — no adjustment period, no irritation

→ Read: Bakuchiol vs Retinol — What the Science Actually Says

→ Read: Is Bakuchiol Safe During Pregnancy?