Summary

Aloe vera is one of the plants I’d rather not be without, and it is also one of the most misunderstood. Three quite different products come out of one leaf. The clear inner gel is the part that goes on burns and grazes, and it’s the part that has been studied for the gut and for blood sugar. The bitter yellow latex just under the rind is a strong laxative, and it is a different product with different uses. This post explains what each one does and how we use the gel at home. It also covers what the research has found, and what to look for if you buy aloe to drink.

Key takeaways

• Three products come out of one aloe leaf, and knowing which one you’re holding tells you most of what you need to know.
• The fresh inner gel is a reliable remedy for minor burns, sunburn, grazes and bites, and the trials back up what herbalists have always said about it.
• Taken as a juice, the gel eases mouth ulcers, reduces reflux and gives modest support in irritable bowel syndrome.
• Aloe gel is one of the best studied plants for blood sugar, with an effect on HbA1c in the same league as psyllium and fenugreek.
• If you buy aloe to drink, choose an unflavoured inner leaf juice that says decolourised or aloin free on the label. The cautions you might see about aloe relate to the latex, not to the gel.

Aloe vera for your skin, gut and blood sugar

I grow plenty of herbs in the garden, but only one of them lives in my kitchen, and it isn’t a culinary herb. An Aloe vera plant stands on the windowsill, so the gel is there the moment one of us needs it. Cut a small piece from a leaf, peel away the green outer layer, and you have a thick, colourless gel that goes straight onto a burn or a graze. My family have used it this way for years, and I can’t think of a simpler piece of herbal medicine than that.

Aloe is also one of the plants people get most confused about, and the confusion isn’t their fault. Three quite different products come out of the same leaf, and they behave nothing like each other in the body, so the cautions written about aloe are really about one part and get applied to all three. Knowing which part you have in your hand is where everything else starts.

One leaf, three different products

The inner leaf gel is the clear, slippery part in the middle of the leaf. It is more than 98 per cent water, and most of what remains is made up of sugars, the most important of which is a large molecule called acemannan. That is the constituent most of the research on aloe gel concerns. This is the aloe of burns, grazes and sunburn, and it’s also the aloe in the juices that have been studied for digestion and blood sugar.

The latex, sometimes called the sap or the bitter juice, is a yellow fluid running in vessels just beneath the green rind. It contains aloin and related compounds, which are strong stimulant laxatives. This is the part that gave aloe its old reputation as a purgative.

Whole leaf juice is made by processing the entire leaf, rind and latex included. It can be decolourised, which means it has been filtered through activated carbon to remove the aloin, or it can be left as it is. Those two products carry the same words on the front of the bottle and may have different effects on your body. That is why the label matters so much when you buy aloe to drink.

Aloe vera gel on your skin

Aloe gel was being used on burns and wounds long before modern research. Herbal medicine has always used the fresh leaf gel to relieve minor burns, including sunburn, and to help cuts, grazes and irritated skin to heal. That is exactly how we use it at home. Sunburn, a splash from the kettle, a graze from the garden, an insect bite that won’t stop itching, and a dry patch of skin in winter all get the same thing. A piece of leaf is split open and the gel is smoothed straight on. It’s cooling within seconds, it costs nothing, and there’s nothing else in it. Any gel we don’t use goes into a covered pot in the fridge and keeps for a day or two. Fresh gel oxidises quickly once the leaf is cut, which is why a living plant, cut as you need it, is the best way to have aloe in the house.

The research agrees with the tradition, and more strongly than most people expect. A 2024 review pooled nine randomised trials and found that burns dressed with aloe gel heal close to four days sooner than burns dressed with other topical preparations. Infection was no more common in the aloe groups. Those trials were mostly in second degree burns, the ones that blister, so this is still kitchen and sunburn territory rather than anything serious. Anything deeper than that, larger than the palm of your hand, or on the face or hands should be seen at A and E first. Aloe can come afterwards.

Reactions to the gel are uncommon, but they can happen, so if your skin tends to react, try a small patch on your inner forearm first. 

Mouth ulcers

Aloe gel even holds to a moist surface, which makes the mouth also a place for it, and it’s one of the gentler things you can put on a mouth ulcer. Across nine trials in 847 people, ulcers dabbed with aloe gel were more than twice as likely to be rated as improved as those given the other options tested. In two of the trials they healed faster as well. The gain is in how quickly the tissue repairs rather than in instant relief, so it suits the ulcer that has been hanging around for days.

Psoriasis and other skin conditions

For psoriasis the trials disagree with each other. An early placebo controlled trial of a 0.5 per cent aloe cream reported that most of the treated group cleared, which is a far bigger effect than anything found since. Other trials have found no benefit at all. In practice I think it’s a reasonable thing to try on a plaque, because it’s soothing, it’s low risk, and it costs nothing to find out. There’s more on the options in my post on topical herbal approaches for psoriasis.

You might also like my post: Best Herbal Remedies to Heal Skin Ulcers

Aloe vera and your gut

Taken orally, aloe is a different proposition, and this is where the three products matter most. Everything that has been studied for the gut is the inner leaf gel or a juice made from it, never the latex. So when I talk about aloe juice from here on, that’s what I mean.

Herbalists have long used mucilaginous plants, the ones that turn slippery in water, to soothe an irritated gullet, and aloe gel is one of the best of them. For reflux, a trial in 79 people gave 10 ml a day of an aloe syrup for four weeks, alongside groups taking omeprazole or ranitidine. In the aloe group, heartburn, acid regurgitation and six other complaints all became less frequent, with no ill effects reported. That is exactly what I’d expect from a plant this soothing, and it’s why aloe juice has a place for anyone whose stomach feels raw after eating.

For irritable bowel syndrome, pooling three randomised trials in 151 people found that aloe improved patient rated scores over placebo, with no safety problems. One of those trials found the strongest response in people with a loose or mixed bowel pattern. A trial hands everyone the same dose of the same product, which is the opposite of matching the herb to the person, so the average across three trials tells you the least it can do rather than the most.

What none of this tells you is why your digestion is behaving as it is. Reflux, bloating and an unpredictable bowel each have several possible causes behind them, and a soothing plant, however good, doesn’t find the cause. If your digestion has changed, my posts on the possible causes of SIBO and on reacting to everything you eat are a good place to start.

Aloe vera and blood sugar

This is the use that surprises people, and it’s the one I most enjoy telling them about. The evidence for it is better than the evidence for a good many things sold for the same purpose. When researchers pooled the meta-analyses of eighteen different plants used for blood sugar, aloe leaf gel produced one of the three largest effects on HbA1c, alongside psyllium fibre and fenugreek seed. HbA1c is the blood test that shows your average blood sugar across the previous two to three months. The drop with aloe was close to 11 mmol/mol, which is the scale UK labs use. No serious adverse effects were reported across the trials.

An earlier analysis of eight trials in 470 people looked at prediabetes and type 2 diabetes separately. Fasting glucose fell in the prediabetes group, and HbA1c fell by around 11 mmol/mol in the type 2 group. Two separate analyses landing on the same figure is a good sign, and it puts aloe among the plants I’d want any woman with rising blood sugar to know about.

But, as a cautionary note, if you already take glucose-lowering medication, you should be aware that aloe can have this effect. Medical herbalists are trained to know when herbs can be used alongside prescription medicines, and it’s a conversation I have with patients often.

You might also like my post: How Fenugreek Lowers Blood Sugar

Choosing an aloe juice, if you buy one

If you’d like to try aloe for your digestion or your blood sugar, the product you choose matters. Choosing well is easy once you know what to look for. Flavoured aloe drinks are the ones to skip. When researchers measured the acemannan in fifteen commercial aloe beverages, the flavoured ones, labelled as 30 to 77 per cent aloe, all contained under 30 mg per 100 g. What little was there had been altered in a way that stops it working. The unflavoured drinks did better, though even among those labelled above 99 per cent aloe only three of eight carried a meaningful amount, because pasteurisation appears to break acemannan down.

So look for three things on the label: inner leaf gel or juice, unflavoured, and either decolourised or free from aloin. That combination gives you the product the gut and blood sugar trials used, without the latex. Anything sold as whole leaf without that wording is a different product, and it isn’t the one for any of the uses in this post.

A word on the latex

Most of the cautions attached to aloe concern the latex, or a whole leaf juice that still contains it. The latex is a stimulant laxative, and it comes with the restrictions that all stimulant laxatives carry. It has its place, prescribed short term and matched to the person, but it isn’t something to buy off a shelf, and it isn’t one you’ll pick up by accident if you follow the three label choices above.

The gel itself has a clean record. On skin, reactions are uncommon, and a patch test covers it. Taken as a decolourised inner leaf juice, the trials above reported no safety problems over the periods they ran. The one place I’d pause is pregnancy and breastfeeding, simply because the gel hasn’t been studied there.

Where this leaves you

For skin, aloe is about as simple and as rewarding as herbal medicine gets, and a plant on the windowsill will cover most of what you’ll ever want it for. For drinking, choose a decolourised inner leaf juice and you have the same thing the trials used, with none of the fuss. And if your digestion or your blood sugar has changed and you’re looking at aloe because of it, it’s a good plant to be getting on with. It’s certainly one I’m glad to have in the house.

You might also like my post: Herbal Medicine vs Conventional Medicine