Tretinoin is one of those compounds that are frequently discussed in skincare/looksmax circles, but the explanation often goes no further than 'vitamin A = collagen.'
While not entirely inaccurate, it does miss out on the majority of what's interesting.
Tretinoin is all-trans-retinoic acid, which is the biologically active retinoic-acid form of vitamin A.
This is different to something like retinol, which has to go through metabolic conversion before becoming retinoic acid.
The important thing is that tretinoin is able to enter cells and interact with nuclear retinoic-acid receptors, which have a role in gene transcription and therefore cell differentiation and function.
So while tretinoin isn't simply a powerful exfoliator, the peeling is indeed a side effect of what you're doing to the skin.
The pharmacology is occurring far deeper than 'dead skin comes off faster.' Additionally, why I think it's stupid to compare the percentage of retinol and tretinoin is that 0.5% of one compound isn't always comparable to 0.05% of another.
While not entirely inaccurate, it does miss out on the majority of what's interesting.
Tretinoin is all-trans-retinoic acid, which is the biologically active retinoic-acid form of vitamin A.
This is different to something like retinol, which has to go through metabolic conversion before becoming retinoic acid.
The important thing is that tretinoin is able to enter cells and interact with nuclear retinoic-acid receptors, which have a role in gene transcription and therefore cell differentiation and function.
So while tretinoin isn't simply a powerful exfoliator, the peeling is indeed a side effect of what you're doing to the skin.
The pharmacology is occurring far deeper than 'dead skin comes off faster.' Additionally, why I think it's stupid to compare the percentage of retinol and tretinoin is that 0.5% of one compound isn't always comparable to 0.05% of another.
There are two broad areas where there's evidence supporting the efficacy of tretinoin:
ACNE and PHOTOAGING.
For acne, topical retinoids have been shown to impact follicular keratinization and prevent microcomedones, which can lead to acne lesions.
They play a role in inflammatory pathways, and so aren't just 'pore cleaners.'
They impact multiple areas of acne pathophysiology.
For photoaging, chronic UV exposure damages the dermal extracellular matrix and contributes to collagen degradation, and tretinoin can increase the expression of procollagen and influence pathways involved in collagen degradation.
This isn't something that has been worked out in a lab and posted on Reddit either; there are long-standing controlled human trials, and recent systematic reviews also find improvements in photo-aged skin.
ACNE and PHOTOAGING.
For acne, topical retinoids have been shown to impact follicular keratinization and prevent microcomedones, which can lead to acne lesions.
They play a role in inflammatory pathways, and so aren't just 'pore cleaners.'
They impact multiple areas of acne pathophysiology.
For photoaging, chronic UV exposure damages the dermal extracellular matrix and contributes to collagen degradation, and tretinoin can increase the expression of procollagen and influence pathways involved in collagen degradation.
This isn't something that has been worked out in a lab and posted on Reddit either; there are long-standing controlled human trials, and recent systematic reviews also find improvements in photo-aged skin.
This is where most of the oversimplified explanations fall apart.
People read:
tretinoin → collagen → better skin
and assume that tretinoin somehow makes your face progressively thicker and younger forever.
obviously not.
Photoaging involves changes to the dermal matrix, including increased degradation and disorganization of collagen, so UV damage increases processes that lead to collagen loss, and tretinoin can partially reverse these and stimulate the production of new collagen.
There have been human studies showing an increase in collagen-related changes in treated skin, alongside visible improvements in wrinkles, pigmentation and texture.
A systematic review of randomized trials found consistent improvements in wrinkles, mottled hyperpigmentation, sallowness and other manifestations of photoaging. Another meta-analysis published more recently found significant improvements in both fine and coarse facial wrinkles compared with vehicle treatment.
So the collagen claim isn't bro-science.
The 'tretinoin will completely transform your face' part is.
People read:
tretinoin → collagen → better skin
and assume that tretinoin somehow makes your face progressively thicker and younger forever.
obviously not.
Photoaging involves changes to the dermal matrix, including increased degradation and disorganization of collagen, so UV damage increases processes that lead to collagen loss, and tretinoin can partially reverse these and stimulate the production of new collagen.
There have been human studies showing an increase in collagen-related changes in treated skin, alongside visible improvements in wrinkles, pigmentation and texture.
A systematic review of randomized trials found consistent improvements in wrinkles, mottled hyperpigmentation, sallowness and other manifestations of photoaging. Another meta-analysis published more recently found significant improvements in both fine and coarse facial wrinkles compared with vehicle treatment.
So the collagen claim isn't bro-science.
The 'tretinoin will completely transform your face' part is.
This is probably the part that causes the most unnecessary stupidity with tretinoin.
Someone starts using it, gets dry and flaky, looks in the mirror and thinks:
"holy shit it's working"
and uses even more.
Bad idea.
Irritation is common with topical tretinoin, particularly when starting treatment. Redness, dryness, peeling, and burning can occur. Clinical studies also find that irritation tends to increase with stronger treatment while efficacy doesn't simply increase in a perfectly linear way.
There's a difference between tolerating a medication and destroying your skin barrier.
If your face is permanently red and painful, that isn't some secret advanced stage of retinoid therapy.
It's irritated skin.
And this is why the whole "if 3x a week works, daily must work 7x better" mentality doesn't really make sense.
Someone starts using it, gets dry and flaky, looks in the mirror and thinks:
"holy shit it's working"
and uses even more.
Bad idea.
Irritation is common with topical tretinoin, particularly when starting treatment. Redness, dryness, peeling, and burning can occur. Clinical studies also find that irritation tends to increase with stronger treatment while efficacy doesn't simply increase in a perfectly linear way.
There's a difference between tolerating a medication and destroying your skin barrier.
If your face is permanently red and painful, that isn't some secret advanced stage of retinoid therapy.
It's irritated skin.
And this is why the whole "if 3x a week works, daily must work 7x better" mentality doesn't really make sense.
This gets butchered constantly.
The simplified pathway is:
Retinol → retinaldehyde → retinoic acid
Tretinoin is already retinoic acid.
So retinol has to undergo conversion before reaching the active retinoic acid form, whereas tretinoin doesn't need that step.
This is one reason tretinoin is pharmacologically more direct.
It doesn't mean retinol is useless.
It also doesn't mean everybody needs tretinoin.
The right comparison is really efficacy vs tolerability vs indication, not "which percentage is bigger."
The simplified pathway is:
Retinol → retinaldehyde → retinoic acid
Tretinoin is already retinoic acid.
So retinol has to undergo conversion before reaching the active retinoic acid form, whereas tretinoin doesn't need that step.
This is one reason tretinoin is pharmacologically more direct.
It doesn't mean retinol is useless.
It also doesn't mean everybody needs tretinoin.
The right comparison is really efficacy vs tolerability vs indication, not "which percentage is bigger."
If we're being realistic, the things I would expect to matter aesthetically are:
• fine lines / wrinkles• uneven pigmentation• rough texture• some forms of acne• comedones• overall photo-aged appearance
Clinical trials have found improvements in wrinkles, mottled pigmentation, roughness and other manifestations of photodamage.
But there are limits.
It isn't going to give you higher cheekbones.
It isn't going to change your mandible.
It isn't going to alter your orbital bones.
And it definitely isn't going to turn an average face into a completely different phenotype.
What it can do is make the skin sitting on top of the structure you already have look better.
That's a much less exciting claim than 'facial transformation,' but it's also the one supported by evidence.
• fine lines / wrinkles• uneven pigmentation• rough texture• some forms of acne• comedones• overall photo-aged appearance
Clinical trials have found improvements in wrinkles, mottled pigmentation, roughness and other manifestations of photodamage.
But there are limits.
It isn't going to give you higher cheekbones.
It isn't going to change your mandible.
It isn't going to alter your orbital bones.
And it definitely isn't going to turn an average face into a completely different phenotype.
What it can do is make the skin sitting on top of the structure you already have look better.
That's a much less exciting claim than 'facial transformation,' but it's also the one supported by evidence.
This is probably the most boring section and also one of the most important.
You can use an evidence-based photoaging treatment while continuing to expose your skin to UV damage.
That makes very little sense.
UV exposure is one of the major drivers of photoaging in the first place. Tretinoin can improve photodamaged skin, but it isn't a force field against sunlight.
So if the goal is genuinely better skin long-term, photoprotection belongs in the same conversation.
Not because sunscreen is some magical looksmax compound.
Just because repeatedly damaging the thing you're trying to improve is counterproductive.
You can use an evidence-based photoaging treatment while continuing to expose your skin to UV damage.
That makes very little sense.
UV exposure is one of the major drivers of photoaging in the first place. Tretinoin can improve photodamaged skin, but it isn't a force field against sunlight.
So if the goal is genuinely better skin long-term, photoprotection belongs in the same conversation.
Not because sunscreen is some magical looksmax compound.
Just because repeatedly damaging the thing you're trying to improve is counterproductive.
This is where I disagree with a lot of looksmaxxing drug threads.
There is a tendency to turn everything into:
compound → dose → frequency → MORE → results
Skin doesn't really work like that.
Tretinoin has established clinical uses, but the concentration, formulation, indication and individual tolerance all matter. Randomly increasing exposure because somebody online claims that irritation equals efficacy isn't evidence-based.
The literature actually shows something more interesting: there is a relationship between efficacy and irritation, but they aren't identical variables. More irritation doesn't automatically mean proportionally more benefit.
So I'd rather think about it as:
consistent treatment + tolerability + time
rather than
maximum possible irritation.
There is a tendency to turn everything into:
compound → dose → frequency → MORE → results
Skin doesn't really work like that.
Tretinoin has established clinical uses, but the concentration, formulation, indication and individual tolerance all matter. Randomly increasing exposure because somebody online claims that irritation equals efficacy isn't evidence-based.
The literature actually shows something more interesting: there is a relationship between efficacy and irritation, but they aren't identical variables. More irritation doesn't automatically mean proportionally more benefit.
So I'd rather think about it as:
consistent treatment + tolerability + time
rather than
maximum possible irritation.
This isn't a compound where you should expect some crazy transformation after five days.
The clinical trials on photoaging are generally months, not weeks. A systematic review of randomized trials included treatment periods from roughly three months to two years, with benefits reported across that longer timeframe.
That makes sense when you remember what we're actually talking about.
You're not painting a filter onto your face.
You're altering cellular behaviour and, over time, remodeling aspects of the skin.
That takes time.
The clinical trials on photoaging are generally months, not weeks. A systematic review of randomized trials included treatment periods from roughly three months to two years, with benefits reported across that longer timeframe.
That makes sense when you remember what we're actually talking about.
You're not painting a filter onto your face.
You're altering cellular behaviour and, over time, remodeling aspects of the skin.
That takes time.
I'd divide the claims into three categories.
Pretty well established: acne treatment, normalization of follicular keratinization, improvement in photo-aged skin, wrinkles and some pigmentation changes.
Plausible / being investigated: various off-label dermatological applications.
Forum speculation: “tretinoin changes facial structure,”more irritation means exponentially more collagen", "higher strength automatically equals better results", etc.
Those aren't the same level of evidence.
A 2025 review still describes the evidence for acne and photoaging as robust while noting that evidence for many proposed off-label applications is considerably weaker.
And honestly, that's what makes tretinoin interesting in the first place.
You don't need to exaggerate what it does.
The actual pharmacology is already pretty fucking interesting.
FINAL TAKE
It isn't a peptide.
It isn't some underground "looksmax compound" where everyone is guessing what happens because there are three studies and 400 anecdotes.
It's an old drug with a very well-characterized mechanism and decades of clinical research behind it.
The aesthetic effect is also fairly straightforward:
Better epidermal turnover + normalized keratinization + changes in pigmentation + dermal remodeling/collagen effects = better skin over time.
Not a new skull.
Not a new face.
Just better skin.
I’ve actually used tretinoin myself, and I’ve definitely noticed results from it. I’m not saying it completely changed my face or anything, but the difference in my skin quality is pretty noticeable.
I’ve spent two days researching, writing all this down don’t AI me.
Pretty well established: acne treatment, normalization of follicular keratinization, improvement in photo-aged skin, wrinkles and some pigmentation changes.
Plausible / being investigated: various off-label dermatological applications.
Forum speculation: “tretinoin changes facial structure,”more irritation means exponentially more collagen", "higher strength automatically equals better results", etc.
Those aren't the same level of evidence.
A 2025 review still describes the evidence for acne and photoaging as robust while noting that evidence for many proposed off-label applications is considerably weaker.
And honestly, that's what makes tretinoin interesting in the first place.
You don't need to exaggerate what it does.
The actual pharmacology is already pretty fucking interesting.
FINAL TAKE
It isn't a peptide.
It isn't some underground "looksmax compound" where everyone is guessing what happens because there are three studies and 400 anecdotes.
It's an old drug with a very well-characterized mechanism and decades of clinical research behind it.
The aesthetic effect is also fairly straightforward:
Better epidermal turnover + normalized keratinization + changes in pigmentation + dermal remodeling/collagen effects = better skin over time.
Not a new skull.
Not a new face.
Just better skin.
I’ve actually used tretinoin myself, and I’ve definitely noticed results from it. I’m not saying it completely changed my face or anything, but the difference in my skin quality is pretty noticeable.
I’ve spent two days researching, writing all this down don’t AI me.
I don’t remember saying to gpt “yo write me a whole ass guide so i can post it on org”
