Standardized oral gel without aloin; topical for minor burns.
≈ −1.0% · ≈ −21 mg/dL — ⚠️ limited evidence
View the study (meta-analysis) →⏱ 3 min read
Aloe vera is probably one of the most universally known medicinal plants and, paradoxically, one of those that generates the most confusion about its actual clinical uses: the plant produces two clearly distinct substances (the clear gel from inside the leaf and the yellow latex from the outer layer, called aloe sap), with radically different activity and safety profiles that should not be confused before discussing efficacy.
The gel is used mainly topically for skin and mucous membranes, with a long tradition and a modest but replicable base of clinical evidence in several indications; the latex contains anthraquinones (aloin), which are potent irritant laxatives, removed from the U.S. market as an OTC ingredient in 2002 over safety concerns (suspected carcinogenicity in animal studies) but still present in some commercial products that are best avoided for prolonged use.
The indication with the best evidence is topical use of the gel on superficial burns (first-degree and superficial second-degree): several small clinical trials have shown that aloe gel speeds healing by 4 to 9 days compared with placebo or topical silver sulfadiazine, a clinically relevant difference in mild to moderate burns that do not require surgery.
In surgical wounds, oral ulcers (aphthous stomatitis), mild psoriasis, and seborrheic dermatitis, several small studies also show modest but consistent effects; the mechanism combines hydration, modulation of skin inflammation, stimulation of fibroblast proliferation, and a possible mild antimicrobial effect, a combination that makes it a reasonable tool for compromised skin and mucous membranes.
In type 2 diabetes and prediabetes, several meta-analyses have shown modest but significant reductions in fasting glucose (10-30 mg/dL) and HbA1c (0.3-0.5 points) with oral use of the gel for 4-12 weeks, especially in people with mild decompensation; the effect is comparable to that of other natural glucose-lowering supplements such as black cumin or mild berberine.
The most plausible mechanism combines modulation of peripheral insulin sensitivity with effects on gastrointestinal motility (which slows glucose absorption) and modulation of the gut microbiota; the effect adds to standard treatment without major drug interactions, which makes it a reasonable option as an adjunct in people with mild diabetes who want to complement their diet and exercise.
In mild gastroesophageal reflux disease, a randomized trial showed efficacy comparable to omeprazole and ranitidine in reducing symptoms (regurgitation, heartburn, belching) with oral aloe gel over 4 weeks, without the potential side effects of proton pump inhibitors that modern medicine has become cautious about prescribing chronically; in mild ulcerative colitis there are promising but not yet consolidated preliminary data.
For topical use: apply the gel directly to the affected area several times a day; commercial products should be at least 95-99 percent pure gel without alcohol or dyes, which can worsen dermatitis; for home use, fresh gel just extracted from inside the leaf (washed thoroughly to remove the yellow latex) is the most concentrated form of biological activity.
For oral use: filtered, decolorized gel (aloin-free) at doses of 30-100 mL daily, strictly avoiding products containing aloe latex (aloin) because of their irritant laxative effects and long-term safety concerns; contraindications to oral use include pregnancy (a uterotonic effect has been described), active inflammatory bowel disease, kidney problems, and concomitant use of digoxin or diuretics (because of the risk of hypokalemia with aloin-containing products).
Information, not medical advice. Scientific evidence reflects the quality of the studies.