Aloe - Precautions and Contraindications
Although it is a natural product, aloe should not be used without prior considerations.
Aloe may cause allergic reactions in some people.
Excessive intake of aloin, a substance in the aloe, is associated with diarrhea, electrolyte imbalance and renal dysfunction.
It can cause contact dermatitis, erythema, and phototoxicity after topical application.
Sometimes the external use of aloe pulp can dry the skin excessively, which could be counterproductive in the case of certain skin diseases. To solve this problem, the pulp can be mixed with olive or sweet almond oil, or a good commercial cream can be used.
Bottenberg et al. (2007) reported a case of acute hepatitis in a patient of 73 years, caused by oral use of aloe capsules to combat constipation. After stop taking the capsules, the patient recovered.
Oral use of this plant is not recommended during pregnancy.
Bottenberg MM, Wall GC, Harvey RL, Habib S (Octubre 2007). Oral aloe vera-induced hepatitis. The Annals of Pharmacotherapy 41 (10): 1740–3.