Topical Uses — Strong Evidence
The strongest research behind aloe vera is in wound healing and burn treatment. Systematic reviews confirm that aloe gel accelerates healing of first- and second-degree burns compared to conventional dressings [1]. The mechanisms are multiple: aloe increases collagen synthesis, improves blood flow to wounded areas, and reduces inflammatory markers at the site [2]. For sunburn, aloe gel provides both anti-inflammatory relief and moisture barrier support. It also shows benefit for minor cuts, abrasions, and radiation-induced skin damage.
How Acemannan Works
Acemannan — the primary bioactive polysaccharide in aloe gel — stimulates macrophage activity and increases the release of immune-signaling molecules like interleukins and tumor necrosis factor. This is what gives aloe its wound-healing acceleration: it does not just soothe on contact but actively recruits immune cells to the area [2].
Internal Uses — Emerging Evidence
Gut Health
A randomized, double-blind, placebo-controlled trial found that oral aloe vera gel significantly improved symptoms in patients with active ulcerative colitis, with clinical remission achieved more frequently in the aloe group compared to placebo [3]. The anti-inflammatory polysaccharides in aloe gel appear to soothe intestinal mucosa and support gut barrier integrity. Anecdotal reports of IBS symptom relief are widespread, though large-scale IBS-specific trials are still needed.
Blood Sugar
A systematic review and meta-analysis found that aloe vera supplementation significantly reduced fasting blood glucose and HbA1c levels in prediabetic and early diabetic patients [4]. The proposed mechanisms include improved insulin sensitivity and modulation of glucose metabolism, though the exact pathways are still under investigation.
Aloe Gel vs. Aloe Latex — A Critical Distinction
This is the single most important thing to understand about aloe vera. The leaf contains two distinct substances:
- Aloe gel — the clear, viscous inner fillet. This is the therapeutic part, rich in acemannan and other beneficial polysaccharides. Safe for topical and internal use.
- Aloe latex — the yellow liquid found just beneath the outer leaf skin. This contains aloin (barbaloin), an anthraquinone compound that acts as a harsh stimulant laxative. Chronic use of aloe latex has been linked to electrolyte imbalances and potential kidney issues. The FDA removed aloe latex laxative products from the over-the-counter market in 2002 due to insufficient safety data.
For internal use, only consume inner fillet gel products that are decolorized (aloin-removed) or clearly labeled as latex-free.
Fresh Plant vs. Commercial Products
Many commercial "aloe vera" products contain minimal actual aloe. Some list it as the first ingredient but use reconstituted powder at low concentrations, padded with thickeners and preservatives. For maximum benefit, use gel directly from a fresh aloe leaf, or choose products that are certified by the International Aloe Science Council (IASC) and list aloe gel concentration clearly [1].