Toxicologic evaluations of DHA-rich algal oil in rats: Developmental toxicity study and 3-month dietary toxicity study with an in utero exposure phase

DHA-rich algal oil ONC-T18, tested for subchronic, reproductive, and developmental toxicity in the rat, did not produce any significant toxicologic manifestations. Based on the absence of maternal or developmental toxicity at any dosage level, a dosage level of 2000 mg/kg/day was considered to be the no observed adverse-effect level (NOAEL) for maternal toxicity and embryo/fetal development when DHA-rich algal oil was administered orally by gavage to pregnant Crl:CD(SD) rats during gestation days 6–19. In a dietary combined one-generation/90-day reproductive toxicity study in rats, the NOAEL for F0 male and female and F1 male systemic toxicity was considered to be 50,000 ppm (highest concentration administered) and 25,000 ppm for F1 female systemic toxicity (higher mean body weight, body weight gain, and food consumption). F0 reproductive performance values, estrous cycle length, gestation length, or the process of parturition, and the numbers of former implantation sites and unaccounted-for sites were unaffected by algal oil exposure. Postnatal survival and developmental parameters in the F1 generation were unaffected by algal oil exposure at all dietary concentrations. There were no neurotoxic effects noted at any algal oil exposure level. The results support the safety of DHA-rich algal oil for its proposed use in food.