There are mornings when everything happens in ten minutes: you pull on your jacket, catch the train, and by the time you arrive your T-shirt is already sticking to your armpits. No one likes that feeling, and yet sweating is a normal reflex — not a malfunction. That said, when sweating becomes a daily source of discomfort, it deserves attention. But it helps to understand what you are trying to soothe before grabbing the first deodorant you see.

What is sweat actually for?

Your body aims to stay at around 37 °C, no more and no less. During exercise, in intense heat or under stress, your sweat glands release sweat, which evaporates on the skin's surface and helps lower your temperature. A well-oiled regulation system, in short.

In some people, this thermostat goes into overdrive. This is known as hyperhidrosis: excessive sweating that mainly affects the armpits, palms and soles of the feet, and often starts in adolescence with no identifiable cause. But unusual sweating can also point to something else — an overactive thyroid, poorly controlled diabetes, menopause, or the side effect of a medicine. If it appears suddenly, affects only one area, or wakes you at night, speak to a healthcare professional: that kind of detail can change the picture.

Skin on a forearm covered in fine droplets of sweat, close-up in warm light
The body regulates its temperature by evaporating sweat

Daily habits that already make a difference

In practice, a few habits can reduce discomfort before you even reach for products. A daily shower with a gentle soap, then careful drying of skin folds — armpits, under the breasts, between the toes — helps limit maceration. For clothing, choose cotton, linen or fabrics that let your skin breathe rather than synthetics that trap moisture and turn the day into a sweatbox.

Young woman in a cotton vest choosing a linen shirt in front of her wardrobe

It is also worth identifying what triggers your episodes: caffeine, alcohol, spicy food, stressful situations. And a few minutes of slow breathing before a tense moment can help take the edge off. These habits can soothe, it is true, but they are not always enough. That is where products come in.

Deodorant or antiperspirant: two very different roles

A deodorant acts on odour: it limits the bacteria that break down sweat. An antiperspirant acts on the sweat itself by forming a plug in the sweat gland duct. Many contain aluminium salts, and that is often where the questions start.

Translucent alum stone on a ceramic dish, fine water droplets
At night, on clean, dry skin, the effect lasts longer

Current data suggest that their use is not a problem at permitted concentrations. In 2020, the European Scientific Committee on Consumer Safety (SCCS) concluded that aluminium compounds in cosmetics do not pose a concerning risk under the intended conditions of use. The French medicines regulator, the ANSM, nevertheless recommends limiting their concentration and not applying them to broken or freshly shaved skin.

Also worth knowing: alum stone is itself an aluminium salt. It is often better tolerated, but it is not 'aluminium-free' — an important nuance if you are trying to avoid this family of ingredients. And a useful step that is often overlooked: apply your antiperspirant at night, on clean, thoroughly dry skin. The glands are at rest overnight, and the effect lasts longer the next day. Rather clever, isn't it?

Natural and eco-friendly options

If you are looking for a gentler alternative, solid deodorants without aluminium salts are having a moment. Their appeal? A shorter ingredient list, often based on bicarbonate of soda, clay or essential oils, and a format with no plastic bottle. On the eco side, look at the certification (Ecocert, COSMOS Organic or a recognised organic standard), whether there is a refill or cardboard packaging, and local manufacturing when it is mentioned. A refillable glass deodorant avoids several bottles a year, which is not nothing.

Solid deodorant in a kraft tube on linen cloth, white clay dish
Solid format, cardboard packaging: fewer bottles a year

Bear in mind, though: a natural deodorant acts on odour, not on the amount of sweat. If you sweat heavily, it will not replace an antiperspirant. In that case, the most honest compromise remains a standard antiperspirant, used only on the areas concerned — no need to slather it all over your body just in case!

When products are no longer enough

If the discomfort persists despite everything, your doctor has other options. Iontophoresis, first, which requires several sessions. Botulinum toxin next, which temporarily blocks the sweat glands. More rarely, surgery — cutting the nerves that control sweating — reserved for very disabling cases; its main risk is compensatory sweating elsewhere on the body. These decisions are made with your doctor or a dermatologist, never on your own.

Young woman sitting in a bright consulting room, hands resting on her knees, soft light
When products are no longer enough, speak to a professional

When should you seek advice? Night sweats, sweating that starts suddenly, affects only one hand or one armpit, or comes with weight loss, fever or palpitations: speak to your doctor.

Budget

Expect to pay around £2 to £10 for a standard deodorant or antiperspirant in a supermarket or pharmacy, £5 to £13 for a solid deodorant without aluminium salts, £7 to £17 for a concentrated antiperspirant from a pharmacy, and £4 to £10 for alum stone. An iontophoresis session often costs £17 to £43, and is rarely reimbursed. Botulinum toxin injections are around £260 to £600 per session, to be repeated. Surgery is hospital-based, with varying out-of-pocket costs. These prices vary by region, pharmacy and size; for a medical procedure, ask for a written quote.

Ultimately, sweat is not an enemy to eliminate, just a signal to listen to. Between everyday habits, the right product at the right time and, if needed, professional advice, there is plenty you can do to get back to calmer days — and T-shirts that stay where they should. Enough to head into summer with a lighter mind!

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