Protective effect of nicotinamide on bracken fern induced carcinogenicity in rats

Abstract
Albino noninbred weanling male and female rats were fed a basic grain diet (Group I), a basic diet supplemented with 0.5% nicotinamide (Group 2), a basic diet containing 33 % bracken fern (BF) (Group 3), or a basic diet supplemented with 33 % BF and 0.5% nicotinamide (Group 4) for 58 weeks. Dietary nicotinamide decreased the BF‐induced incidence of both intestinal and bladder tumorigenesis by about 40%. The inhibitory effect of nicotinamide on the BF‐induced intestinal and bladder tumors was significant at p< 0.05 and p < 0.07, respectively.