Sweating is a natural phenomenon, essential for the body’s thermoregulation. Through this mechanism, the skin eliminates excess heat in the form of sweat, mainly in response to physical exertion, an increase in ambient temperature, or strong emotions. This process, although indispensable, can become a source of discomfort when it is excessive, poorly localized, or associated with unpleasant odors.
Faced with this situation, many patients, concerned about preserving their comfort without harming their health, look for natural alternatives to conventional antiperspirants, especially those containing aluminum salts. The question most frequently asked during consultation is simple : is there a truly effective natural antiperspirant ? And if so, which one should be chosen, in complete safety ?
To answer this question, it is necessary to clearly differentiate the terms, understand the mechanisms of sweating, and then objectively examine the natural options available today.
Before discussing natural solutions, it is important to clarify a point that is often misunderstood. A deodorant masks or neutralizes body odors, generally with the help of antibacterial agents (such as essential oils or alcohol) and fragrances. It does not block sweat production, but acts on the bacteria responsible for breaking down this sweat, which generate unpleasant odors.
An antiperspirant, on the other hand, acts directly on sweat secretion. Conventional formulas contain aluminum salts (aluminum chlorohydrate or aluminum chloride), which temporarily block the pores of the sweat glands. This mechanism is effective but has been the subject of controversy — mainly for reasons of skin tolerance or toxicological concerns, although not formally proven.
Many patients therefore turn to “natural” alternatives, hoping to achieve a comparable antiperspirant effect. But the reality is more nuanced : to date, there is no 100 % natural solution with antiperspirant efficacy equivalent to conventional formulas. However, certain plant- or mineral-based substances can help reduce sweating, improve comfort, and neutralize odors in a gentle and lasting way.
The search for a natural antiperspirant is often part of a broader approach : respecting the skin, reducing exposure to chemical substances, making ecological choices, or wishing to better manage perspiration without completely eliminating it.
On this point, it is essential to remember that sweating is not a problem in itself. It is a vital defense mechanism. Wanting to completely block perspiration, without medical indication, does not necessarily make sense — except in cases of confirmed hyperhidrosis. For most people, the goal is therefore to regulate perspiration, preserve a feeling of freshness, and reduce the discomforts linked to humidity or odors.
Natural antiperspirants do not eliminate sweat, but they can reduce humidity thanks to absorbent powders (cornstarch, baking soda, white clay); neutralize odor-causing bacteria with gentle antibacterial agents (essential oils, alum stone, zinc ricinoleate); soothe the skin with plant extracts (chamomile, aloe vera, calendula).
In this context, the term “best” must be put into perspective : it is not about finding a miraculous product, but rather a well-tolerated natural formula that matches the physiology, lifestyle, and specific expectations of the patient.
Among the most frequently mentioned natural options, alum stone holds a special place. Used since Antiquity, this stone is a crystal of double sulfate of aluminum and potassium. It is naturally astringent and slightly antiseptic. When moistened and applied to the skin, it forms a thin film that tightens the pores and limits bacterial proliferation.
Although it contains aluminum, it is a stable and non-soluble form, which explains its reputation as a “gentler” solution compared with conventional antiperspirants based on chlorohydrates. Natural alum stone (extracted from rock) must be distinguished from synthetic stones, produced from reconstituted aluminum.
In practice, alum stone is well tolerated, non-irritating, and provides a moderate but real reduction of perspiration, especially in the underarm area. It does not block perspiration in a radical way, but it is a good alternative for sensitive skin or for patients wishing to avoid conventional formulas.
Many so-called natural formulas combine several ingredients with complementary properties. Sodium bicarbonate, for example, is widely used for its absorbent and antibacterial effect. It is very effective against odors, but it can irritate sensitive skin if used in high doses or too frequently.
Essential oils (palmarosa, tea tree, lavender, sage) have a recognized antimicrobial action. They reduce the breakdown of sweat and limit odors. However, they require precautions in use : some are photosensitizing or allergenic, and they are not suitable for all skin types or for all situations (pregnant women, children, etc.).
Clays (kaolin, bentonite) and absorbent plant powders (cornstarch) help regulate humidity by capturing excess sweat. They do not act directly on the sweat gland, but improve comfort, reduce the sensation of dampness, and protect clothing.
These solutions, when well formulated, can meet the needs of people with moderate perspiration. On the other hand, in cases of hyperhidrosis, they remain insufficient as a long-term treatment.
If sweating becomes excessive, persistent, or localized in a troublesome way (armpits, hands, feet, face), or if it is accompanied by significant social or professional discomfort, medical advice is essential.
In such cases, natural solutions, even well chosen, are not sufficient. There are targeted medical treatments, such as botulinum toxin (Botox) injections, iontophoresis, topical treatments with aluminum chloride under medical supervision, and oral treatments in certain indications.
A doctor will be able to make an accurate diagnosis, rule out a secondary cause (endocrine disorder, medication use), and propose an appropriate management plan.
The search for a natural antiperspirant should not be limited to what is applied to the skin. Sweating reflects a global physiological balance, and as such, certain dietary choices can directly or indirectly influence sweat production and body odors.
Several groups of foods are known to stimulate the sympathetic nervous system, which increases sweat secretion. This is particularly the case for caffeine (found in coffee, black tea, energy drinks), alcohol, which dilates blood vessels and accelerates thermogenesis, strong spices (chili, ginger, black pepper), which can activate skin thermoreceptors, and sulfur-rich foods (garlic, onion, cabbage), which can alter the odor of sweat without increasing its volume.
These substances are not pathogenic in themselves, but they can exacerbate sweating in predisposed or sensitive individuals. Conversely, a diet rich in fresh vegetables, antioxidants, and adequate hydration (water, unsweetened herbal teas, water-rich fruits such as cucumber or watermelon) can have a moderating effect on metabolism and thus limit excessive sweating.
Certain plants are also reputed for their regulatory action on perspiration. For example, sage (Salvia officinalis) is traditionally used to reduce excessive sweating, particularly during menopause. Its active compounds are thought to act on the sweat glands through modulation of the autonomic nervous system. It can be consumed as a tea, in capsule form, or as a liquid extract, after medical advice.
Finally, it is essential to emphasize that overweight, regular consumption of very fatty or sugary meals, or nutritional deficiencies (notably in magnesium and zinc) can contribute to a sweating imbalance. Adopting a balanced, moderate, and varied diet therefore constitutes a valuable complementary approach in the natural regulation of sweat.
The aluminum salts used in conventional antiperspirants (aluminum chlorohydrate or aluminum chloride) have a recognized action : they temporarily block the sweat ducts, thereby reducing sweat flow. Their effectiveness is indisputable. However, for several years, studies have suggested a possible link between aluminum and the risk of breast cancer or neurodegenerative diseases, particularly Alzheimer’s disease.
To date, no solid scientific evidence confirms a direct link between the topical use of aluminum salts in the underarms and the development of serious pathologies. Health agencies consider the use of aluminum in cosmetics safe within certain concentration limits and in the absence of skin lesions. Nevertheless, they advise caution in cases of very frequent use on shaved, irritated, or fragile skin.
In light of these uncertainties, many people opt for aluminum-free alternatives or products containing natural alum (such as alum stone), whose molecular structure differs from synthetic aluminum salts. Natural alum stone does contain aluminum, but in a stable, insoluble form that is poorly absorbed by the skin. This makes it a reassuring option for those seeking a compromise between moderate efficacy and safety.
Therefore, it is important not to give in to unfounded fear or to demonize all compounds containing aluminum. The choice of an antiperspirant should be based on a nuanced analysis, taking into account the level of perspiration, skin tolerance, personal medical context, and individual preferences.
Article written by Dr Romano Valeria
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