What is aloe vera?
Aloe vera is a succulent plant that lives in dry, desert areas. Its leaves have a gelatinous core that makes up 65-80% of the total weight of the plant and possesses numerous health properties [2][3].
People have been using aloe vera since ancient times to treat many ailments, ranging from wounds and stomach problems to lowering blood sugar or preventing cancer [4]. Today, aloe vera is often used in the cosmetic industry for its significant moisturising, repairing, antioxidant and antimicrobial properties [5].
What are the benefits of aloe vera for hair?
There are multiple potential ways aloe vera can help with hair health and regeneration. Here are some of the best-documented benefits.
1. It can moisturise and soften your hair
Aloe vera gel is 99% water, while the remaining 1% consists of fatty acids, vitamins and minerals [3]. While the nutrients can only benefit your hair when taken orally, the fatty acids help lock in moisture and prevent skin dryness. This makes aloe vera gel excellent at hydrating and moisturising your scalp and hair, leaving it smooth, soft and shiny [5]. It can be used as a deep-conditioning mask, to treat a dry scalp and improve the condition of hair that feels like straw.
2. It may help treat certain scalp infections
This plant extract possesses numerous antifungal, antibacterial and antiseptic properties [6] [3], which means it may be effective against certain common scalp problems. The salicylic acid it contains, alongside other antimicrobial agents [3], may help treat yeast infections on the scalp, such as dandruff and seborrheic dermatitis.
Aloe vera may also inhibit the growth of the fungus that causes ringworm (tinea capitis) [7]. Moreover, lab studies show this plant extract is also effective against certain bacteria that can cause scalp folliculitis [8].
However, more evidence is needed to determine the extent to which aloe vera would act as an effective antimicrobial when applied topically to the human scalp.
3. It may help reduce scalp inflammation
Extracts from aloe vera can reduce the production of prostaglandin E2, a chemical in your body that causes inflammation and pain [3]. This may help reduce the symptoms of inflammatory scalp conditions, such as alopecia areata or scalp psoriasis.
Furthermore, a substance called lignin contained in the aloe vera gel can have a beneficial effect in treating scalp eczema and scalp psoriasis, by reducing inflammation, moisturising the skin and enhancing the effect of topical steroid treatments [8][3]. However, clinical trials are necessary to demonstrate the extent of these effects.
4. It may help reduce oxidative stress
Aloe vera is rich in antioxidants, such as Vitamins B12, C and E. They can counter the effect of oxidative stress that builds up in your hair from various sources, such as environmental pollution, harsh hair styling products, or smoking [9].
Oxidative stress can damage the hair fibre, contributing to hair ageing, the development of alopecia and premature greying [10]. So countering this process can keep your hair fuller, healthier and more youthful looking.
5. It may help strengthen your hair
When taken orally, the many nutrients found in aloe vera (such as vitamins A, B, C, E, copper, selenium, magnesium, zinc) can provide your hair follicles with the resources they need to grow strong, healthy strands. But simply applying this remedy topically is not likely to have the same effect, as the micronutrients are not likely to reach the hair follicles.
However, a 2019 study revealed that aloe extract can have a protective effect on hair when added to perm treatment, by improving the condition of its cuticles [11].
6. It can clean your hair and reduce greasiness
Saponins are soapy substances found in plants that can create foam and lather when mixed with water. They have cleansing and antiseptic properties and can be found in high quantities in aloe vera extract.
Since this plant also contains enzymes that break down fat, it is excellent for making natural shampoo that can gently remove excess oil from your scalp and hair, cleaning them and freeing them from buildup [3].
7. It may help protect against UV radiation
Research shows that aloe vera has photoprotective properties, as it helps keep hair cell membranes intact [12]. This may help shield your hair from some of the sun’s radiation, preventing your hair from ageing prematurely and keeping it healthier for longer.
However, it is still a good idea to wear a hat when going outside in hot weather, as excessive sunlight is not good for your hair and it is still unclear to what extent aloe vera extract can protect it.
8. It is said to promote hair growth
Some researchers (and many marketers) assert that aloe vera for hair can stimulate hair follicles for growth and even curb hair thinning [13][14]. However, the evidence of this effect is mostly anecdotal, as no studies have been performed so far to demonstrate it.
Small-scale trials have shown promising hair growth effects of aloe vera in combination with other ingredients (e.g. liquorice and ethanol) in animals [15]. But human trials with just aloe gel applied topically to the scalp are still needed.