It’s hard to imagine more improbable than the arrival of onion in shampoo. However, this ingredient, long confined to homemade recipes, has been gaining popularity for several months, particularly on TikTok. If the trend amuses or surprises, it raises a very concrete question: why does this food, known for its strong smell, arouse such enthusiasm in hair cosmetics?
Onion in the hair: an idea that comes back a long way
Used for generations in homemade hair care products, onion is far from a new ingredient. In the form of juice, infusion or decoction, it has been applied directly to the scalp in several regions of the world, notably in Asia and North Africa. This gesture was part of a logic of natural care, often associated with the desire to strengthen hair or limit its loss.
The return of this practice in current routines, often relayed on social networks, is based on the same justifications. Onions naturally contain sulfur, an element found in the structure of keratin. For this reason, it is seen as a potentially beneficial ingredient for the hair fiber. But traditional uses were based on empirical observations, without formal validation of their effects.
Strong smell, confusing texture: a unique experience
The recent popularity of onion shampoo is accompanied by a simple observation: its smell raises questions. Even when filtered or processed into a cosmetic treatment, the characteristic aroma of onion remains difficult to ignore.
Added to this is a sometimes viscous texture when used in homemade preparation, far from the usual standards of a mild or perfumed shampoo. This sensory shift can discourage some users, despite initial curiosity. The idea of introducing such an identifiable food ingredient into a beauty routine clashes with the classic codes of hair care.
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Results: what we know so far
To date, no large-scale clinical trial can confirm that onion, incorporated into a shampoo, promotes hair growth or sustainably improves hair health. An old study, carried out on a small sample in a specific medical context, suggested positive effects on localized alopecia. But these results have not been confirmed by independent research.
The natural presence of sulfur and antioxidants in onions fuels certain hypotheses about its benefits for hair, without formal scientific validation. Its use remains associated with traditional practices or personal routines, without there being any solid proof of its effectiveness.
As it stands, onion shampoo cannot be presented either as a recognized active treatment, nor as a documented solution. It remains an individual choice, sometimes motivated by the desire to test a raw ingredient, but with no guarantee of results.
Practical questions about using onion shampoo
1. Does onion smell go away after rinsing?
The odor may remain noticeable depending on the concentration of the extract used and the preparation method. In the case of home use, it is often more marked than with a classic cosmetic formula.
2. Can this shampoo be used every day?
It is generally recommended to gradually integrate it into your routine, once or twice a week, in order to observe the scalp’s tolerance and the effect on hair texture.
3. Is there a real effect on hair growth?
No large-scale study has proven the direct effectiveness of onions on growth. Interest in this ingredient is based on ancient practices and its composition, but the results remain variable.
4. Is this type of treatment suitable for all hair profiles?
Onion is sometimes used on fine or weakened hair, but there is no precise indication depending on hair type. Progressive use allows compatibility to be assessed.
5. Can you make onion shampoo at home?
It is possible with simple recipes based on diluted onion juice, but you must remain attentive to skin tolerance. A localized test is recommended before application to the entire scalp.
