Introduction & Objective: Changes related to thyroid hormones cause gonadal dysfunction and infertility Present study aimed at determining the effect of Dosin ( Sativa Nigella and honey mixture) on sex stroids and spermatogenesis following Methimazole induction of hypothyroidism in rats.Materials and Methods: In this experimental study, 60 adult male Wistar rats aged about 10-11 weeks were randomly divided into six groups of ten, including the control group, The Sham group,experimental group 1; the adminstration of methimazol at dose of 25 mg/kg for 10 day , experimental group 2; the adminstration of Dosin alone at dose of 200 mg/kg for 21 days, groups Experiments 3 and 4 ; the adminstration of Dosin at the dose of 100 and 200 mg/kg for 21 days, were divided. At the end of the experiment, blood was taken from the heart of the animals and the serum concentrations of dihydrotestosterone, androsterone, dihydroepiandrosterone and androstenedione were measured. Hematoxylin-eosin staining was also performed to examine testicular tissue changes.Result: The amount of dihydrotestosterone, dihydroepiandrosterone and androstenedione in experimental groups 3 and 4 showed a significant increase compared to experimental group 1. The amount of androsterone in experimental group 4 increased compared to experimental group 1.In experimental groups 3 and 4, primary spermatocyte cells, spermatids and the amount of epididymal sperm storage showed a significant increase compared to experimental group 1.Conclusion: Based on the results, black seed and honey (ducin) improve and multiply the cells of spermatogenic germ line in rats with hypothyroidism
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