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The only human study on aloe vera used 300 mg twice daily. There is no evidence to suggest whether this is the best dose, but benefit was seen at this dosage. *
Topical aloe preparations range in concentrations from as little as 0.5 percent to as high as 99 percent. There is no data to suggest that lower doses are less effective than higher doses.
Oral aloe preparation comes in a variety of forms, including capsules, soft gel caps, powders, and juices. Supplements doses range from 100 milligrams to 10,000 milligrams. Larger doses confer to a higher risk of side effects. For safety reasons, keep to the lowest possible dose. Few clinical studies have used anything more than 500 milligrams daily.
Although aloe vera gels are intended for topical use, some manufacturers will sell cold-pressed "gels" for oral use. These products (often marketed as "full strength," "whole leaf," "pure filtered") are thicker and more viscous than aloe vera juice and are commonly sold by the gallon for digestive health.
If you decide to use an oral gel preparation, do so for no more than 10 days and stop immediately if you experience any side effects. *