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Callistemon citrinus  Skeels (Myrtaceae) exhibits many biological activities. This study analyzes for the first time, the toxicity, obesogenic, and antioxidant effects of  C. citrinus  in rats fed with a high fat-fructose diet (HFFD). Four studies using male Wistar rats were conducted: (a) 7 groups ( n  = 3): control (corn oil) and ethanol extract of  C. citrinus  leaf (single oral dose at 100–4000 mg/kg) for acute toxicity; (b) 2 groups ( n  = 8): control (corn oil) and  C. citrinus  (1000 mg/kg/day) for 28 days for subacute toxicity; (c) 3 groups ( n  = 4) with single oral dose of lipid emulsion: control (lipid emulsion),  C. citrinus  and orlistat (250 and 50 mg/kg, respectively) for lipid absorption; (d) 4 groups ( n  = 6): control (normal diet) and 3 groups fed with HFFD: HFFD only,  C. citrinus  and simvastatin (oral dose 250 and 3 mg/kg, respectively) for 13 weeks. Antioxidant enzymes and biomarkers were evaluated and inhibition of pancreatic lipase was determined  in vitro . Toxicological studies of  C. citrinus  showed no differences in biochemical parameters and lethal dose (LD 50 ) was higher than 4000 mg/kg.  C. citrinus  inhibited pancreatic lipase activity, with IC 50  of 392.00 µg/mL, and decreased lipid absorption by 70%. Additionally, it reduced the body weight 22%, restored the activities of antioxidant enzymes, and reduced the biomarkers of oxidative stress. Callistemon citrinus  showed an effect against oxidative stress by reducing biomarkers and induced antioxidant system, without toxic effects.

Evaluation of the toxicology, anti-lipase, and antioxidant effects of Callistemon citrinus in rats fed with a high fat-fructose diet