Pregnancy and Korean skincare: check the leave-on BHA, not just the retinol

The short version: if you are clearing out your shelf for pregnancy, do not stop at the retinol serum. Check the leave-on BHA too, meaning salicylic acid in toners, serums and pads. Salicylic acid in a wash you rinse straight off has brief skin contact, so we left rinse-off cleansers out of the numbers below.

We screened every Korean label in our set against the ingredients commonly listed as pregnancy cautions. 199 products came back carrying at least one. Broken down by class, counting products rather than mentions. Some products carry two classes at once and a few were flagged for an ingredient outside these five, so the classes do not add up to exactly 199:

• Retinoids: 91. Retinol, retinaldehyde, retinyl palmitate, hydroxypinacolone retinoate.
• Salicylates: 83. Salicylic acid, capryloyl salicylic acid, betaine salicylate.
• Essential oils: 19. Sage, peppermint, clary sage, mugwort, tea tree.
• Bakuchiol: 6, flagged as retinoid adjacent rather than as a retinoid.
• Brightening actives: 3. Kojic acid, arbutin.

Retinoids and salicylates run almost neck and neck. Most people going through their bathroom cabinet look for a retinol serum first, but among the salicylate products, 54 of them are toners, serums and toner pads. The pore toner and the exfoliating pad you use every day are about as common a hit as the retinol serum.

What does the screen actually mean?

It is worth being precise, because an empty result is easy to over read.

When a label comes back clear, what happened is that the printed ingredient list was read against a checklist: retinoids, salicylates, hydroquinone and arbutin type brighteners, certain UV filters. Nothing matched.

That is not a clinical clearance. It is a statement about one list of words. It does not cover fragrance sensitisation, it does not cover how much of anything is in there, and it certainly does not cover you specifically.

It is also not evenly documented. Of the labels that came back clear, only a minority carry a written note recording that the screen ran and what it looked for. The rest simply have nothing recorded either way. We would rather say that plainly than imply every clear result was audited.

MEDICUBE Zero Pore Pad 2.0

This is the kind of product that puts salicylates near the top of this article: an exfoliating pad sold for daily use, and one you leave on after wiping.

Salicylic acid is at position 14 of 47. Willow bark extract is at 21 and betaine salicylate at 29, so the label carries three salicylate type entries. None of them has a disclosed level.

The directions are the point. The brand tells you to wipe with the embossed side, go over the face again with the soft side, and then pat in the leftover toner instead of rinsing it off. Unlike a wash you rinse after thirty seconds, this salicylate stays on your skin. That is why we count pads like this and not rinse-off cleansers.

The copy calls it a daily, low irritation pad. Lactic acid sits fourth and denatured alcohol fifth. The caution block carries the statutory AHA notice telling you to use sunscreen with it, and no page we found says anything about pregnancy.

Caution ingredients: salicylic acid, betaine salicylate. No levels disclosed Brand warns: no, only the sunscreen and patch test lines

celimax Retinol Shot Tightening Serum

The best behaved brand on the retinoid side, and it still gets the reason wrong. That is why the retinoids start here.

Retinol is disclosed at 0.1 percent at position 15 of 42, which is a real and checkable level, and this is a genuine retinoid product rather than one wearing the name.

The brand prints its own pregnancy advisory, which almost nobody does. It says it does not recommend use during pregnancy or breastfeeding. The direction of the advice is right and we want to give full credit for it existing at all.

The reason it gives is wrong. The page attributes the caution to hormonal changes making skin more sensitive during that period. That is a comfort argument. The actual reason topical retinoids are avoided in pregnancy is caution about vitamin A class risk to the developing baby, which is a completely different kind of concern.

Why this matters practically: a reader who accepts the stated reason could reasonably conclude the caution is about irritation, and that they can trade it off if their skin feels fine. The real reason is not one you can feel your way past.

A second claim on the page is well built and still limited. A 24 hour patch test on 31 adults at a named clinical centre with stated dates returned an average skin reaction of 0.00. That is a real method with a real panel. It measures acute contact irritation, not the cumulative retinoid adjustment the brand's own guidance describes over the first two weeks.

Caution ingredient: retinol, disclosed at 0.1 percent Brand warns: yes, for the wrong reason

Theralogic Retinal Wrinkle-Elasticity Cream

A disclosed retinoid at a substantial level, sold to everyone.

Retinaldehyde is at position 19 of 36, printed at 3,000 parts per million, which is 0.3 percent. Retinaldehyde converts to the active form in fewer steps than retinol, so this is at the strong end of what you can buy.

The spec block says all skin types. That line sits in the mandated product information table rather than in ad copy, which makes it worse rather than better: it is a field a responsible distributor fills in, and it has been filled in with a blanket that the formula does not support. Retinaldehyde at a disclosed 0.3 percent has a documented initial irritation profile, and no tolerance or patch test for this product is published.

The directions are the other gap. They say to take an appropriate amount and spread it evenly, with no frequency and no night only instruction on a 0.3 percent retinal cream. Someone new to retinoids following that literally will have a bad two weeks.

Six peptides sit at positions 26 and 29 to 33, which supports the anti-wrinkle framing in principle, though none of them carries a level.

Caution ingredient: retinaldehyde, disclosed at 0.3 percent Brand warns: no

Bioheal BOH NAD Freeze Cell Retinal Eye Cream

A retinoid at a trace level, on the thinnest skin on the face, sold to everyone.

Retinaldehyde is at position 45 of 67, printed at 10 parts per million, which is 0.001 percent. That is three hundred times smaller than the cream above.

We are including it for two reasons that pull in opposite directions, and both are worth holding.

The disclosed level is very small. A reader worried about retinoid exposure should know that 10 parts per million and 0.3 percent are not the same purchase, and the brand printing the figure is the only reason anyone can tell.

And the all skin types line is still unsupported, more so here than anywhere else in this article. It is a tolerability claim attached to a retinoid applied to eyelid skin twice a day, with no patch test, no dermatological or ophthalmological test, no participant count and no endpoint published anywhere.

If you are pregnant and looking at this product, the label gives you two facts: the retinoid is present, and it is there at a disclosed trace.

Caution ingredient: retinaldehyde, disclosed at 10 parts per million Brand warns: no

Dr.Althea 345 Relief Spot Powder

Six acids, no levels, no pH, and a denatured alcohol base.

Salicylic acid is at position 10 of 42. Then glycolic acid at 11, gluconolactone at 14, tartaric acid at 15, malic acid at 16 and lactic acid at 20. Denatured alcohol is second and calamine third.

Not one of the six acids carries a disclosed level, and no pH is published. The pH is the number that decides whether the acids act at all, which we went through in LHA or BHA, so this label leaves you unable to bound either the dose or the activity.

Tea tree oil sits at 22, which is a second flagged class on the same product, and there is no fragrance entry despite that.

As a construction this is the classic settling drying suspension: calamine and titanium dioxide suspended in an alcohol and water base, dabbed on a spot overnight. That is a real and old formulation type and it works for what it is. The salicylate is what puts it on this page. It is a leave-on, but it goes on one spot rather than the whole face, which is a very different area from wiping a salicylate pad over everything.

Caution ingredients: salicylic acid, tea tree oil. No levels disclosed Brand warns: no

How to read your own shelf

Start with the toners, serums and pads, not the rinse-off cleansers. In our screen, more than half of the salicylate products were toners, serums and toner pads. They stay on your skin, so the ingredient stays too.

Check whether it stays on or rinses off. A salicylate in a wash you rinse off after thirty seconds has brief skin contact, so we do not count salicylates in rinse-off cleansers, cleansing balms or wash-off packs as a pregnancy caution. The same molecule in a toner, pad or serum that stays on your skin does count.

Learn the four salicylate spellings, because they look different on a list: salicylic acid, capryloyl salicylic acid, betaine salicylate, and willow bark extract or water.

Learn the retinoid spellings too: retinol, retinal or retinaldehyde, retinyl palmitate, retinyl retinoate, and hydroxypinacolone retinoate. A product can carry three of them at once, and one on this page carries a disclosed one plus two undisclosed ones.

Note that bakuchiol shows up in this screen too, on six products, flagged as retinoid adjacent rather than as a retinoid. It is not a vitamin A derivative, and that is not the same as a clearance.

The label tells you what is in the bottle and roughly how much. For what the retinoid class is and how the forms differ, starting retinol has the background.

Common questions

Is salicylic acid in a face wash a problem?

We do not count rinse-off cleansers as a pregnancy caution. You rinse them straight off, so skin contact is brief. The ones to look at are leave-on products with the same ingredient: toners, pads and serums. Plenty of people use a pore toner or an exfoliating pad without knowing it carries salicylic acid.

What about bakuchiol as a retinol alternative?

Bakuchiol is not a vitamin A derivative, so it does not carry the retinoid caution for that reason. It appears in this screen on six products anyway. And several products combine bakuchiol with an actual retinoid, so read the whole list rather than the marketing.

Are essential oils a pregnancy concern?

The oils flagged in our screen are a small and specific set rather than essential oils in general: sage, peppermint, clary sage, mugwort and tea tree. Those are the names to look for on the list.

Is niacinamide or hyaluronic acid on the list?

Neither appeared as a flag anywhere in our screen. They are the ingredients most routinely considered acceptable in topical use, which is why so many pregnancy-safe routines end up built around them.

If the ingredient list looks clear, is the product safe?

A clear result means the printed list was read against a checklist and nothing matched. It is not a clinical clearance, it says nothing about how much of anything is present, and many of the clear results in our set carry no written record of the screen at all. Treat it as a starting point.

If you have a product and cannot work out whether it carries a salicylate or a retinoid, send us the listing and we will find every spelling of both on it.