Aloe veraBotanical

• Burns (applied to the skin)Likely helps

  This is the use with the most behind it. NCCIH reports clinical research suggesting topical aloe gel speeds burn recovery and reduces burn pain [1].
  
  Healthline, citing a 2023 research review, reports topical aloe gel outperforming silver sulfadiazine and other comparators for second-degree burns across several studies [20]. ^[1]

• Blood sugar in prediabetesPossibly helps

  A 2016 systematic review and meta-analysis of 8 randomized trials (470 patients) looked at oral aloe and glycaemic control [2].
  
  In prediabetes, fasting plasma glucose fell by -0.22 mmol/L against control (95% CI -0.32 to -0.12, p<0.0001) [2].
  
  HbA1c did not move significantly in that group (-2 mmol/mol, 95% CI -5 to 1) [2]. ^[2]

• Blood sugar in type 2 diabetesPossibly helps

  In the same meta-analysis, fasting plasma glucose improved marginally at -1.17 mmol/L (95% CI -2.35 to 0.00, p=0.05) [2].
  
  HbA1c fell significantly, by -11 mmol/mol (95% CI -19 to -2, p=0.01) [2].
  
  ⚠ The authors themselves describe the evidence as limited in quality and highly heterogeneous, and call for well-powered trials using standardized preparations [2]. Read the HbA1c result as suggestive, not settled. ^[2]

• Weight and fat massPossibly helps

  NCCIH describes one small study in which a specific oral aloe gel product taken for 8 weeks modestly reduced weight and fat mass [1].
  
  The participants were adults with overweight or obesity who also had diabetes or prediabetes, so it is a narrow population and a single trial [1]. ^[1]

• Constipation and IBS — two sources, two verdictsPossibly helps

  ⚠ Mayo Clinic says it is not clear whether oral aloe latex does anything for constipation, while noting the latex does act as a laxative and can cause cramps and loose stools [4].
  
  A peer-reviewed meta-analysis on irritable bowel syndrome concluded aloe showed efficacy for short-term symptom control [3].
  
  Its proposed mechanism: gut bacteria convert barbaloin into aloe-emodin-9-anthrone, which raises intestinal water content and motility [3].
  
  Both are kept here — the meta-analysis is IBS-specific rather than about constipation generally [3][4]. ^[3]

• The 2002 FDA aloin ban — what it was and wasn'tPossibly helps

  The FDA removed aloin, the latex-derived anthraquinone, from over-the-counter laxative products in 2002 [10].
  
  The trigger was manufacturers failing to submit required safety data, not a finding that aloin doesn't work [10]. ^[10]

• Other skin conditionsPossibly helps

  NCCIH describes a smaller body of research on topical aloe for genital herpes, lichen planus, psoriasis, oral submucous fibrosis, radiation-related skin damage and mouth sores from dental appliances [1].
  
  Smaller body of research means exactly that — fewer and weaker studies than the burn evidence [1]. ^[1]

• Sunburn, acne and eczemaPossibly helps

  The American Academy of Dermatology recommends aloe-containing products to soothe sunburn, though research doesn't show faster recovery — just less discomfort [20].
  
  One study found aloe gel combined with prescription tretinoin worked better for acne than tretinoin alone [20].
  
  For eczema it has not been shown effective, and some people get skin irritation, so patch-testing first is advised [20]. ^[20]

• Hair growthPossibly helps

  Both WebMD and Healthline, medically reviewed, state there is no strong clinical evidence that aloe improves hair growth [21][22].
  
  WebMD does note some research support for aloe on an itchy, scaly scalp from seborrheic dermatitis, the condition behind much dandruff [21]. ^[21]

• Inner leaf gelThe lowest-anthraquinone option.

  Elemental content

  The clear fillet only, with rind and yellow latex physically stripped before processing [6][7]

  Absorption

  Sold as drinkable juice or gel; the decolorization step is optional on this route [7]

  Best for

  The lowest-anthraquinone option. A 2023 review of gel and decolorized drinkables at ≤10 ppm aloin found no genotoxicity in the studies it covered [1].

• Decolorized whole leaf extractDrinkable whole-leaf products.

  Elemental content

  Whole leaf ground, then filtered through activated carbon to strip latex phenolics [7]

  Absorption

  The IASC labeling standard caps aloin at 10 ppm for oral products [7]

  Best for

  Drinkable whole-leaf products. Note the carbon step also removes 19–23% of the complex polysaccharides compared with plain gel [8].

• Non-decolorized whole leaf extractNothing, on current evidence. IARC classified it Group 2B, possibly carcinogenic to humans, in 2016, after a 2-year NTP…

  Elemental content

  Whole leaf with nothing filtered out — aloin can run 10,000–20,000 ppm [8]

  Absorption

  Same drinkable format as the decolorized version, radically different chemistry [8]

  Best for

  Nothing, on current evidence. IARC classified it Group 2B, possibly carcinogenic to humans, in 2016, after a 2-year NTP rat study found clear evidence of large-intestine tumors [10].

• Dried latexSee the limit above. 1 g/day for a few days has caused short-term kidney failure and has been fatal .

  Elemental content

  The yellow-brown material between rind and gel, carrying the laxative anthraquinones [6]

  Absorption

  Historically sold as a stimulant laxative; the FDA pulled aloin from OTC laxatives in 2002 [10]

  Best for

  See the limit above. 1 g/day for a few days has caused short-term kidney failure and has been fatal [4].

• Cramps and diarrhea

  The most commonly reported effects of oral aloe are stomach cramps and diarrhea, driven by its laxative compounds [13]. ^[13]

• Kidney or heart disease

  Prolonged aloe latex use is linked to watery diarrhea and electrolyte imbalance [11].
  
  The resulting potassium loss is dangerous in people with a history of kidney or heart disorders, so latex use is considered contraindicated there [11]. ^[11]

• Pregnancy and breastfeeding

  NCCIH states oral aloe — gel, latex or whole-leaf extract — may be unsafe during pregnancy and while breastfeeding [1].
  
  An NIH review, citing a 1999 WHO monograph, adds that laxative use in pregnancy may carry teratogenic and toxicological risk to the fetus [11].
  
  Mayo Clinic likewise advises against oral aloe in either form for both groups [4]. ^[1]

• Plant allergy — with an outdated family name attached

  An NIH Bookshelf review advises avoiding aloe if you are allergic to plants in the Liliaceae family, such as garlic, onions and tulips [11].
  
  ⚠ That grouping is out of date: modern taxonomy places Aloe vera in Asphodelaceae, not Liliaceae [17]. Flagged as a naming inconsistency in the allergy literature rather than resolved here. ^[11]

• Liver injury — two reviews, two pictures

  NIH's LiverTox rates aloe a likely but rare cause of drug-induced liver injury, likelihood score B [15].
  
  Injury typically appears 3 to 24 weeks after starting and usually resolves on stopping, with no deaths in LiverTox's own series [15].
  
  ⚠ A separate systematic review of 22 aloe-attributed liver-injury cases found death in 10% and chronic injury in 5%, with 86% recovering [15].
  
  Different case-collection scopes rather than a flat contradiction — but the second figure is materially more alarming and is not being buried here. ^[15]

• Genotoxicity — an unresolved lab signal

  ⚠ NCCIH notes laboratory research suggesting even decolorized extract might damage DNA or chromosomes [1].
  
  A 2023 review of decolorized whole-leaf and inner-leaf products at ≤10 ppm aloin — the commercial food-grade level — found no genotoxicity [1]. Both are kept: the review reflects realistic product levels, the DNA concern comes from different laboratory exposures. ^[1]

• Digoxin

  Oral aloe latex can lower blood potassium, and low potassium worsens digoxin's side effects [4].
  
  Mayo Clinic advises not combining the two [4]. ^[4]

• Diuretics

  Water pills plus oral aloe latex can drive potassium down too far, causing hypokalemia [4]. ^[4]

• Diabetes medications

  Oral aloe gel alongside diabetes drugs may raise the risk of hypoglycemia [4].
  
  That is consistent with aloe's own glucose-lowering data rather than a separate mechanism [2][4]. ^[4]

• Anticoagulants, antiplatelets and sevoflurane

  Oral aloe may itself slow blood clotting, and the latex's loose-stool effect can add to warfarin's action, raising bleeding risk [4].
  
  Mayo Clinic flags the same clotting concern with sevoflurane, a surgical anesthetic [4]. ^[4]

• Stimulant laxatives

  Combining aloe latex with other stimulant laxatives can overwork the bowel and risk dehydration [4]. ^[4]

• Any other oral medicine

  The latex's laxative effect can reduce how much of an orally taken drug is absorbed, lowering its effectiveness generally [4]. ^[4]

Aloe vera is not a nutrient scattered across foods — the plant is the source, specifically its leaf [10].

It does show up as an added ingredient in commercial products, including yogurts, beverages and some desserts [10].

No government or academic source found here establishes a best time of day for oral aloe, and NCCIH's review doesn't address timing at all [1].

Verywell Health, medically reviewed, states outright that no conclusive evidence identifies a best time to drink aloe juice [14].

What it offers instead is goal-based, non-clinical: evening may produce a laxative effect by morning, shortly before meals may suit reflux-type symptoms, and with or after meals may support fuller absorption [14].

The very common "empty stomach first thing" advice is brand and blog content, not a sourced finding, so it isn't presented as fact here [14].