Two different medicines in one plant, and only one of them should go on your skin. — Aloe vera
remedyAloe vera Aloe vera — hand-drawn plate, stylised. Not for identification — use a field guide and verify with a second source before eating any wild plant.
Aloe vera contains two distinct preparations and confusing them is the main mistake.
The inner gel — the clear mucilage in the centre of the leaf — is a soothing topical for minor burns, sunburn and irritated skin. It has randomised trial evidence in burn healing and in radiation-induced skin reactions, and it is one of the better-evidenced topical plant preparations in this handbook. It is also a laxative if eaten in quantity.
The latex or "aloin" layer — the yellow sap just under the rind — is a stimulant laxative (aloin, an anthraquinone) and is the reason whole-leaf aloe juice causes cramping and diarrhoea. Oral aloe latex is a genuine purgative and is not a casual supplement, and long-term anthraquinone laxative use is associated with dependence and electrolyte problems. In 2002 the US removed aloe laxative ingredients from the market over insufficient safety data.
So: gel on the skin, gel in a drink sparingly, latex not at all as a casual remedy.
Growing it is easy and it is the right plant for a windowsill — bright light, gritty free-draining soil, water sparingly. Overwatering kills more aloe than cold does.
What the studies found
Meta-Analysis2024Journal of burn care & research : official publication of the American Burn Association
Effects of Aloe vera on Burn Injuries: A Systematic Review and Meta-Analysis of Randomized Controlled Trials.
Burn injuries cause severe pain, infection risks, psychological distress, financial burdens, and mortality, necessitating effective care.
Meta-Analysis2023International journal of molecular sciences
Abiotic Stress in Crop Production.
Finally, this review provides information about the response to abiotic stress in major European crop plants-wheat, sugar beet, maize, potatoes, barley, sunflowers, grapes, rapeseed, tomatoes, and apples.
Effects of Aloe vera in adults with mucocutaneous problems: A systematic review and meta-analysis.
AV might have beneficial effects in reducing pain scores and the severity of mucocutaneous problems compared with placebo, especially with limited mild to moderate adverse effects.
| | |
|---|---|
| Life | Succulent perennial |
| Propagation | Offsets ("pups") — the easy route |
| Light | Bright light; a south windowsill is ideal |
| Soil | Gritty, free draining — cactus mix |
| Water | Sparingly. Let it dry out between waterings |
| Hardiness | Not winter hardy here — bring it in |
| Harvest | Cut outer leaves at the base; use the gel fresh |
Overwatering is the main killer. Keep it above about 5 C, in a pot with drainage, and ignore it more than you think.
Preparation
Topical gel — cut an outer leaf, stand it cut-end down for 10 minutes to drain the yellow latex, then split and apply the clear gel directly.
Draining the latex first matters — it is the irritant and laxative part.
After sunburn or a minor burn — apply fresh gel, repeatedly. The trial evidence is for topical burn use.
Preserving gel — blend with a little vitamin C or vitamin E and refrigerate; use within a week.
Juice — use inner-gel juice, not whole-leaf. Check the label; whole-leaf products contain aloin.
Do not use oral aloe latex as a laxative.
Cautions and interactions
Aloe latex (the yellow sap) is a stimulant laxative. Oral whole-leaf aloe causes cramping and diarrhoea and is not a casual supplement.
Do not eat aloe latex. Long-term anthraquinone laxative use causes dependence and electrolyte disturbance.
Avoid oral aloe in pregnancy, in children, and in intestinal obstruction, IBD or appendicitis.
Topical aloe can cause allergy in sensitive people.
Do not use topical aloe on a deep or infected wound.
Oral aloe may interact with diabetes medication and diuretics.
When this is not a self-care problem — get help
A burn larger than the palm, or any burn that is white, charred or painless, or on the face, hands, feet or joints — emergency care.
A wound with spreading redness, heat, pus or fever — urgent assessment.
Severe abdominal pain, or constipation with vomiting and distension — urgent care; do not use a laxative.
Effects of Aloe vera on Burn Injuries: A Systematic Review and Meta-Analysis of Randomized Controlled Trials. Journal of burn care & research : official publication of the American Burn Association 2024; doi:10.1093/jbcr/irae061 PubMed 38605441
Abiotic Stress in Crop Production. International journal of molecular sciences 2023; doi:10.3389/fpls.2022.887103 PubMed 37047573
Second-Degree Burns and Aloe Vera: A Meta-analysis and Systematic Review. Advances in skin & wound care 2022; doi:10.1097/01.ASW.0000875056.29059.78 PubMed 36264753
Effects of Aloe vera in adults with mucocutaneous problems: A systematic review and meta-analysis. Journal of advanced nursing 2021; doi:10.1111/jan.14653 PubMed 33336470
Antiseptics for burns. The Cochrane database of systematic reviews 2017; doi:10.1002/14651858.CD002106.pub4 PubMed 28700086