Introduction: Dr Iguedo Goko Cleanser® is a herbal formulation (HF) widely marketed in southern Nigeria and purported to be very efficacious for the management of various diseases including giardiasis, toilet infections, hypertension, diabetes, ulcer, impotence, low libido, low sperm count amongst others. Medicinal plants reportedly produce an array of adverse reactions capable of inducing harmful conditions, including death. Aim: This study evaluated the subchronic toxicity concern of HF on testicular function and gonadal histoarchitecture in Wistar rats. Methods: Thirty Wistar rats of both sexes were randomly divided into six groups (5/group) and were orally administered HF for 60 days. The control groups received 5 mL/kg of distilled water; the treatment groups were administered 476.24 and 158.75 mg/kg body weight of HF each for both male and female rats. Using standard procedures, semen analysis was done for all male rats. Animals were anaesthetised and sacrificed on the 62nd day; the gonads were eviscerated, weighed and fixed in 10% buffered formalin for histopathological examinations. Results: Significant (p

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