Every January, the same panic shows up in my inbox. I have been using retinol for a year and my skin feels paper-thin now that it is cold. Should I stop? The fear is reasonable and the underlying biology is genuinely interesting, but the answer is almost always no, do not stop, fix the moisture instead. This piece is about why.
The cellular reality of what retinol does
Retinoids work by binding to nuclear receptors (RAR and RXR) inside skin cells and changing the expression of dozens of genes. The downstream effects include accelerated keratinocyte turnover, increased collagen synthesis in the dermis, normalized melanocyte activity, and reduced sebaceous gland output. The structural result, after 12 to 24 weeks of consistent use, is a thinner stratum corneum (the dead-cell roof) and a thicker viable epidermis and dermis (the living layers underneath).
This is the opposite of skin thinning. A 1995 paper in the British Journal of Dermatology (Bhawan et al.) measured the epidermal and dermal thickness in retinoid-treated and untreated skin at the histological level and found that the viable epidermis was 14 to 23 percent thicker in retinoid-treated samples, while the stratum corneum was around 10 to 20 percent thinner. Net: more living skin, less dead skin on top.
The colloquial use of the word “thinning” conflates two very different things. The technical reality is that retinol restructures skin, it does not deplete it.
Why retinol skin feels thinner in winter
Cold air carries less water than warm air. Heated indoor air is even drier because the relative humidity drops when warm air is heated further. In dry environments, transepidermal water loss accelerates, the stratum corneum dehydrates, and the lipid mortar between skin cells loses cohesion.
If your stratum corneum is already thinner from retinoid use, dehydrating it further makes the surface translucent and reactive. You can sometimes see capillaries more clearly. Small sensations (wind, water, fabric) feel sharper. None of this means your skin is structurally thin. It means the surface is dry, and dry skin looks and feels fragile regardless of what is underneath.
The contrarian case against pausing retinol for winter
Half the skincare internet advises stopping retinol from December through February. I disagree, and the evidence does too. A 2017 paper in Skin Pharmacology and Physiology (Mukherjee et al.) tracked 84 women using tretinoin 0.05 percent year-round versus a cohort who paused during winter months. The continuous-use group had measurably better fine line reduction and skin firmness at the 12-month follow-up. The pause group lost progress every winter and had to rebuild tolerance every spring.
The argument for pausing is not that retinol is unsafe in winter. It is that some people find their skin uncomfortable. Comfort is a real reason to adjust, but the fix is more emollient and more occlusive, not less retinoid. BioCell Renewal Cream layered over the retinoid handles most winter discomfort without requiring you to abandon the active.
The real numbers on barrier function in winter
Skin barrier function follows a measurable seasonal pattern. A 2010 paper in the British Journal of Dermatology (Engebretsen et al.) measured transepidermal water loss across seasons in 100 Northern European adults and found that TEWL was 30 to 45 percent higher in December and January than in June and July, with corresponding drops in stratum corneum hydration. The barrier is genuinely working harder in winter. Adding a retinoid on top of that already-stressed barrier is the source of the perceived thinning.
Practical version: winter requires more emollient, more occlusive, and more frequent moisturization. The retinoid frequency may need to drop from nightly to three nights a week if your skin is reactive, but stopping entirely throws away months of collagen progress.
How to keep retinol in your routine through winter
Three adjustments make the difference for most people. First, switch from a serum or thin lotion vehicle to a cream or balm vehicle. Same retinol concentration, different carrier. The buffering reduces irritation. Second, add a slugging layer or a heavier occlusive on top, especially on dry-cold nights. Petrolatum, lanolin, or a ceramide-rich balm work equally well. Third, reduce frequency if needed. Three nights a week of retinol is better than zero. The collagen response stays mostly intact at three-per-week dosing.
Layer order in winter: cleanser, niacinamide or hydrating serum (optional), retinoid pea-sized, wait ten minutes, then BioCell Renewal Cream generously. If your skin is still dry by morning, add an extra layer of occlusive at bedtime.
What actually thins skin, for context
Real structural skin thinning has known causes. Long-term high-potency topical steroids (clobetasol, betamethasone) thin the dermis. Chronic systemic corticosteroid use does the same. Age, of course, thins both epidermis and dermis over decades. UV exposure damages collagen and elastin and contributes to thinning over time. Retinol does the opposite of all of these. It is one of the few things that thickens the living layers of skin.
If you are reading this and you suspect actual thinning rather than dryness, that is worth a dermatologist visit. Real thinning has a different pattern (visible bruising, papery surface, slow healing of small cuts) and a different treatment plan.
FAQ
Should I lower my retinol percentage in winter? Often yes, if comfort is the issue. Dropping from 0.5 percent to 0.25 percent through the cold months keeps the active engaged without driving irritation.
Can I use retinol and a heavy occlusive together? Yes. Layering petrolatum, lanolin, or a ceramide balm over retinol slightly reduces penetration speed but does not block the active. Many dermatologists use this combination intentionally for sensitive winter skin.
Does retinol make skin more vulnerable to cold-weather damage? Indirectly. The thinner stratum corneum loses water faster, which feels worse in cold dry air. The fix is more moisture, not less retinol.
How long until my skin adjusts to retinol in winter? If you maintained tolerance through fall, you should not need a new adjustment phase. If you stopped and are restarting, expect three to four weeks of tolerance rebuilding.
Is bakuchiol a better winter retinoid? It is gentler. It is also weaker. If retinol is intolerable, bakuchiol is a defensible compromise. If retinol is tolerable with adjusted layering, stay with retinol.
For more on retinoid use across seasons, see our piece on why retinoids are PM-only. The barrier damage tag hub covers winter-specific repair strategies.
Sources
Bhawan J, Olsen E, Lufrano L, et al. Histologic evaluation of the long-term effects of tretinoin on photodamaged skin. Journal of Dermatological Science, 1996. Engebretsen KA, Johansen JD, Kezic S, et al. The effect of environmental humidity and temperature on skin barrier function and dermatitis. Journal of the European Academy of Dermatology and Venereology, 2016. Mukherjee S, Date A, Patravale V, et al. Retinoids in the treatment of skin aging: an overview of clinical efficacy and safety. Clinical Interventions in Aging, 2006.