What Is Witch Hazel, What Does It Do? Tannin and Irritation Note

When people say witch hazel, most think of a single toner from the pharmacy shelf, but there are at least three different products sold under this name on labels. Despite the name, it is not related to the hazelnut you eat. What matters is which one is in your bottle, because effects and risks differ accordingly.

The three types of witch hazel you see on labels

Tannin is found at 3-10% in leaves and 8-12% in bark. The lack of marked effect in antioxidant tests in water obtained by distillation also supports this difference. The sentence "tannin closes pores" is therefore not very applicable to the distillate. Even if you choose a product labelled alcohol-free, you need to look at the ingredient list.

What does the astringent effect really do?

Tannins bind to proteins, giving the skin a sense of tightness. In the US, witch hazel is listed as a non-prescription astringent active. This feeling is often temporary; we know of no solid human study showing that it permanently shrinks pores or reduces sebum. Realistic options for the look of pores are explained in the pore guide.

What does the evidence say?

• UV redness: In 30 volunteers, a 10% distillate lotion reduced redness by about 20% at hour 7, and by 27% at hour 48. This is not a sunscreen; it is a small result on post-sun care.
• Eczema: The distillate emulsion reduced itching and redness, but its effect remained lower than that of hydrocortisone cream.
• Sensitive scalp: In a retrospective observation of 1.373 people, shampoo and toner gave satisfaction; there was no control group and the result rests on participants' reports.
• Acne: Bark extract reduced inflammatory signals triggered by the acne bacterium in the laboratory. An interesting point: hamamelitannin, often highlighted, alone was found ineffective. We know of no human data on acne.

The EU herbal medicines assessment lists this plant under traditional use for mild skin inflammation and dryness. This does not mean strong clinical evidence; it describes long-term traditional use.

Which skin can it irritate?

Skin irritation is the side effect highlighted in evaluations, though its frequency is not well measured. The real risk most often comes not from the plant but from the alcohol. The alcohol in cosmetics article covers this in detail. Watch for these:

• On dry, stinging or red skin, and if you have rosacea, do not make alcoholic witch hazel toner your first choice.
• If you use it for acne and your skin feels tight, reduce the frequency or stop. Dryness does not solve acne; it strains the barrier.
• If you use an acid or retinoid, do not layer an additional alcoholic toner in the same step.
• Test the new product on the inner arm or elbow crease, twice a day, for 7-10 days. Stop if there is a rash.