Supplement analysis backed by scientific evidence · PT

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Moderate evidenceHeart & metabolic

Aloe Vera

Oral aloe vera gel produces small but fairly consistent reductions in fasting glucose and HbA1c in prediabetes and untreated type 2 diabetes, though the trials are small and low quality. For everything else it is marketed for — detox, IBS, general "gut cleansing" — the evidence is thin, and the laxative latex form carries real safety concerns.

What the science says

  • Lowers fasting glucose and HbA1c in prediabetes and early type 2 diabetes Moderate evidence

    A 2016 systematic review and meta-analysis of randomized trials found oral aloe vera preparations reduced fasting blood glucose by roughly 30 mg/dL in people with diabetes and by a smaller margin in prediabetes, with HbA1c falling around 1.05% in diabetic subgroups. A second 2016 meta-analysis restricted to prediabetes and untreated diabetes found similar directional benefits over 4-14 weeks. Both authorships flagged small sample sizes, heterogeneous extracts and high risk of bias, so the true effect is probably smaller.

  • Improves lipid profile Limited evidence

    The same meta-analyses reported reductions in total cholesterol and triglycerides in some subgroups, but effects were inconsistent across trials and disappeared in several sensitivity analyses. No trial was powered for cardiovascular outcomes.

  • Relieves constipation or IBS symptoms Limited evidence

    Aloe latex (not the inner-leaf gel) is an anthraquinone stimulant laxative and clearly causes bowel movements, but controlled data in IBS or functional constipation are limited to a handful of small trials with mixed results. The FDA removed aloe latex from over-the-counter laxative products in 2002 for lack of safety data.

  • Speeds burn and wound healing (topical) Limited evidence

    Systematic reviews of topical aloe for burns and wounds report faster healing in several small trials, but the studies are heterogeneous, poorly blinded and use very different preparations. Topical use is low-risk but should not replace standard burn care.

Dosage & safety

Studied doseTrials of oral aloe gel used roughly 100-1,000 mg/day of dried gel extract, or 15-30 mL/day of inner-leaf gel juice, for 4-14 weeks. Choose decolorized (charcoal-filtered), inner-leaf products standardized to be low in aloin; whole-leaf aloin-containing latex is the laxative fraction and is not appropriate for daily use.
SafetyInner-leaf gel is generally well tolerated. Aloe latex/whole-leaf extract causes cramping, diarrhea and potassium loss, and non-decolorized whole-leaf extract is classified by IARC as possibly carcinogenic to humans (Group 2B) based on rodent colon tumors; the EU banned aloe-emodin and emodin-containing preparations in food supplements in 2021. Case reports link oral aloe to acute hepatitis. Because it lowers glucose, it can compound the effect of insulin and sulfonylureas; potassium loss from the latex can potentiate digoxin toxicity and loop diuretics. Avoid the latex in pregnancy, breastfeeding, inflammatory bowel disease and bowel obstruction.

Scientific references

Where to buy

Protocol for Life Balance, Aloe Vera Gels, 10,000 mg, 100 Softgels

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