Ascorbate and alpha-tocopherol attenuate hepatorenal injury and modulate CYP2E1 and Nrf2 expression in rats exposed to herbalised alcoholic beverage

Background The rising consumption of herbal alcoholic beverages in Nigeria, driven by unverified health claims, poses growing public health risks and adds to the global disease burden. Aim To evaluate the effects of ascorbate and alpha-tocopherol supplementation on hepatorenal biochemical parameters, histopathology, and expression of oxidative stress-related genes (Nrf2 and CYP2E1) in rats exposed to a herbal-based alcoholic beverage. Methods Twenty-eight adult male Wistar rats were randomly assigned into four groups (n=7 per group) using a computer-generated randomisation, with all outcome assessments performed under blinded conditions. Group I consisted of the unexposed control rats. Group II rats received a daily oral dose of alcohol at 0.2 mL/kg/bw. Groups III and IV were also administered alcohol daily at 0.2 mL/kg/bw but were additionally treated with ascorbate (500 mg/kg) and alpha-tocopherol (300 mg/kg), respectively, for 28 days. Hepatorenal biochemical parameters, hepatic and renal Nrf2 and CYP2E1 expression, and histopathological changes were subsequently evaluated. Results Supplementation with ascorbate (500 mg/kg) or α-tocopherol (300 mg/kg) was associated with significantly lower (p < 0.05) ALP, ALT, AST, creatinine, and urea levels compared with alcohol-exposed untreated rats. Vitamin supplementation was associated with the modulation of alcohol-induced overexpression of CYP2E1 and Nrf2, and partially restored the altered biochemical parameters. Histopathological examination further revealed mitigated alcohol-induced architectural disruptions in the liver and kidney, suggestive of the protective effects of antioxidant supplementation. Conclusion Ascorbate and alpha-tocopherol supplementation were associated with attenuation of alcohol-induced hepatorenal biochemical alterations, partial normalisation of liver and kidney function parameters, and modulation of oxidative stress-related gene expression (CYP2E1, Nrf2), findings consistent with a potential adjunctive role of these vitamins in mitigating alcohol-related organ toxicity rather than indicating definitive therapeutic effects. Mechanistic conclusions are limited by the absence of direct oxidative stress marker measurements (lipid peroxidation, glutathione status, antioxidant enzyme activities), and interpretation is limited by the absence of pure ethanol and vitamin-only control groups and the lack of independent chemical verification of the test beverage.