---

Why Skin After 40 Reacts Differently to Retinol

Retinol speeds up cell turnover and boosts collagen. That is why it works so well and why it can also cause so much irritation. During perimenopause and beyond, falling oestrogen makes skin thinner, slower to repair and less able to hold onto its natural oils. So a retinol that suited you fine at 30 can become hard to manage at 45. It is not that your skin has got weaker. It just cannot bounce back the way it used to.

This is the pattern I hear most often from women at this stage. Retinol used to work. Now it does not, even at the same strength you always used.

---

What Bakuchiol Is and How It Works

So what do you reach for instead? The answer that keeps coming up in dermatology research is bakuchiol.

Bakuchiol comes from the seeds and leaves of a plant called Psoralea corylifolia, used for centuries in traditional Indian and Chinese medicine. It is not related to vitamin A at all, but it seems to switch on similar processes in skin cells, supporting collagen, evening out pigment and improving texture, without working through the same pathway as retinol.

It also does a few things retinol does not. Studies have found it has strong antioxidant properties and helps skin heal and regenerate faster. The obvious question is whether it can actually match retinol's results, or whether it's simply the gentler, weaker option. That's what the research set out to test.

---

The Clinical Evidence: Bakuchiol vs Retinol Head to Head

The 2019 study

The main study on this is a trial published in the British Journal of Dermatology in 2019. 44 people with an average age of 47 used either 0.5% bakuchiol cream twice a day or 0.5% retinol cream once a day, for 12 weeks. Here's what was actually reported.

Measure	Bakuchiol 0.5%	Retinol 0.5%
Wrinkle severity, 12 weeks	Around 20% reduction in both groups, no significant difference
Hyperpigmentation improved	59% of participants	44% of participants
Scaling and stinging	Reported less often	Reported more often

Figures as reported in the published study abstract. Scaling and stinging were reported qualitatively as more common in the retinol group; the study did not publish an exact percentage breakdown for this measure.

What other research says

A later review in the Journal of Integrative Dermatology looked across the wider research and came to the same conclusion. It found that bakuchiol can do much of what retinol does, with real advantages when it comes to safety and how easily it can be formulated into a product.

So the results hold up. The part worth sitting with is why that gap in irritation matters so much for skin at this particular stage.

---

Why the Irritation Gap Matters More Than the Ingredient List

For skin over 40, irritation is not just uncomfortable. When retinol causes redness and disrupts the barrier, it triggers inflammation and ongoing low-grade inflammation is itself part of what makes skin look older. So some of the benefit retinol is meant to give you can be cancelled out by the irritation it causes.

Bakuchiol avoids this because it is naturally calming on skin. It also stays stable in light and air, unlike retinol, so it is easier to build into a daily routine and it doesn't carry retinol's sun-sensitivity warning, more on that below.

---

The Importance of Sun Sensitivity

There's one part of that irritation gap that deserves its own answer rather than a passing mention: what each ingredient does to your skin's relationship with the sun.

Retinol is a known photosensitiser. Once applied, it makes skin more reactive to UV light while it is adjusting, which is exactly why it's used at night and always paired with daily SPF the next morning. Skip the SPF and your skin is more vulnerable to sun damage than usual.

Bakuchiol does not carry this same risk. Current research indicates that purified bakuchiol is not photosensitising, which is part of why it can be used morning or evening without the same precautions retinol requires.

None of this changes the basics. Sun sensitivity or not, daily SPF stays non-negotiable for skin after 40, both actives included.

---

Which One Should You Choose?

With the evidence and the sun-sensitivity question both covered, the decision comes down to what each ingredient actually costs and delivers. Here's a fuller side-by-side, so you can weigh it up for your own skin rather than take anyone's word for which is "better."

Criteria	Retinol	Bakuchiol
Wrinkles & fine lines (crow's feet)	Significant improvement	Significant improvement
Hyperpigmentation	Improvement in 44% of users at 12 weeks	Improvement in 59% of users at 12 weeks
Irritation & redness	Common, especially in the first few weeks	Some reported, but significantly less frequent
Scaling & stinging	Reported more often	Reported less often
Dryness & barrier disruption	A known risk, especially early in use	Possible but uncommon
Sun sensitivity	Increases photosensitivity, night use required	Does not increase photosensitivity
Pregnancy & breastfeeding	Not recommended, a vitamin A derivative	Generally safe, but always check with a doctor
Application	Evening only, gradual introduction needed	Can be used morning and evening from the start

Wrinkle, pigmentation, scaling and stinging figures are drawn from the Dhaliwal et al. 2019 trial cited above. Other rows reflect the broader, consistent pattern across the peer-reviewed literature on each ingredient rather than one single study.

If you haven't used either yet, bakuchiol is generally the lower-risk place to start, especially after 40. You get a genuine trial of what the results feel like without the adjustment period or the risk of quitting a few weeks in because your skin rebelled. If it works well and you want to push further later, retinol is still there to try.

Should You Consider Switching

If you're already using retinol, switching is worth considering if any of the following sound familiar:

• Retinol reliably leaves your skin red, tight or flaking, even at low concentrations or reduced frequency
• You have started to notice retinol's effects taking longer to settle, or settling less completely, than they used to
• Your skin has become reactive to products it previously tolerated without issue, a common pattern through perimenopause
• You want a consistent, daily-use active rather than one that requires careful cycling to avoid overwhelming the skin

Retinol still has a place if your skin tolerates it well and you want an ingredient with decades of research behind it. But the real question is not which one is better. It is which one you can actually stick with, night after night, for long enough to see a change.

---

How to Introduce Bakuchiol Into a Post-40 Routine

Decided it's worth trying? Bakuchiol is gentle enough that you do not need to ease into it slowly the way you would with retinol. Still, a few things help you get the best out of it.

Use it twice a day if your formula allows it

In the 2019 study, bakuchiol was used twice a day and still caused less irritation than retinol used once a day. So unlike retinol, it does not need to be kept to evenings only.

Give it 12 weeks

Once you've settled on a frequency, the next thing to manage is patience. Bakuchiol and retinol both need around three months of steady use before you see real change. Sticking with it matters more than using a lot of it.

Support your barrier at the same time

While you wait for results, don't leave your skin to do this alone. Bakuchiol works best alongside skin-identical lipids and good hydration, not layered on top of a routine already doing too much.

Wear SPF every day

And the one step that carries through no matter what else changes: bakuchiol doesn't require the same sun precautions as retinol, but daily SPF is still non-negotiable for skin after 40, whatever active you're using.

---

The Bottom Line

Bakuchiol is not a stronger version of retinol. It is a way to get similar results, less lines, better tone, more collagen support, without the irritation that makes retinol so hard to keep up with as skin gets older. When your skin is already working harder to recover, that difference matters. It is not a small detail. It is the whole point.