Aloin (Aloin-A)(mixture of A&B), a natural anthracycline from Aloe vera, is a tyrosinase inhibitor.

ALOIN Inhibits Interleukin (IL)-1β-Stimulated IL-8 Production in KB Cells.

Aloin B (Isobarbaloin) is an isomer of aloin.1. The extract of A. vera and its active ingredient aloin cause melanin aggregation leading to skin lightening via alpha adrenergic receptor stimulation, the result opens new vistas for the use of A. vera regarding its clinical application as a new nontoxic melanolytic agent for the treatment of hyperpigmentation. 2. Dietary supplementation of aloe components (aloin, aloesin and aloe-gel) can ameliorate intestinal inflammatory responses in a 3% dextran sulfate sodium (DSS)-induced ulcerative colitis rat model, in particular, aloesin is the most potent inhibitor.

Aloinoside A, an aloin isolated from Astragalus membranaceus, is the enantiomer of Aloinoside B and is a biomarker used in metabolic research. Its metabolic products by rat intestinal bacteria include aloin, isoaloin and hydroxy metabolites.