Is willow bark extract a natural salicylic acid?

No. It contains salicin, a different molecule, and skin does not convert it to salicylic acid at any meaningful rate. The quantity is also orders of magnitude too low.

Does willow bark exfoliate?

Not the way a BHA does. Salicylic acid works because it is oil-soluble and acts inside the follicle; a trace-level water-soluble glycoside does neither.

So is willow bark extract useless?

No — its polyphenols and flavonoids give real soothing, antioxidant and mild antibacterial effects. It is just not a BHA replacement.

Is it safe during pregnancy?

Salicylates are restricted in pregnancy at drug doses. A trace botanical extract is a very different exposure, but if you are being careful it is worth asking rather than assuming.

What should I use instead for clogged pores?

Salicylic acid at 0.5–2%, or betaine salicylate if you want something gentler that still reaches inside the pore.

Willow Bark Extract — Ingredient Guide

How it works

Willow bark contains salicin, a glycoside that shares an ancestor with salicylic acid — the historical link that gave aspirin its name. The extract also carries polyphenols, flavonoids and tannins, which have genuine antioxidant and anti-inflammatory activity, and it is those, not the salicin, that do most of the observable work in a cosmetic.

The evidence

The marketing claim is that willow bark is a natural BHA, equivalent to salicylic acid without the irritation. Three things undercut it.

First, salicin is not salicylic acid. Converting one to the other requires metabolism — in the body it happens in the gut and liver — and there is no evidence that skin performs that conversion at any meaningful rate. Second, the quantity is wrong by orders of magnitude: salicin content in a typical extract is a fraction of a per cent, while salicylic acid works at 0.5 to 2%. Third, salicylic acid exfoliates because it is oil-soluble and lowers pH inside the follicle; a water-soluble glycoside at trace levels does neither.

What the extract genuinely does is soothe, provide antioxidant activity, and contribute mild antibacterial effect. Those are real benefits and enough to justify its presence — just not as a replacement for a BHA.

Suitability

Oily or slightly congested skin that reacts badly to acids
Anyone assembling a low-irritation routine
Not a substitute if you actually need pore exfoliation — use salicylic acid

Concentration

Usually 0.5–5% of extract, which corresponds to a very small amount of salicin. A percentage on the front of a bottle refers to the extract, not the active, and the two are not comparable.

Conflicts & combinations

None of note; it layers freely and is often used to make a formula sound gentler. One caution worth stating: salicylates are advised against in pregnancy at drug doses, and while a trace-level botanical extract is a very different exposure, anyone being careful may prefer to ask rather than assume.