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Dutasteride has a much longer half life and blocks much more DHT than finasteride. Dutasteride also inhibits both Type 1 and Type 2 5AR, whereas finasteride blocks only type 2. Type 1 is present in most tissues in the body where 5 alpha-reductase is expressed, and is the dominant form in sebaceous glands. Type 2 is the dominant isoenzyme in genital tissues, including the prostate.
I suggest you read this publication for starters: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1472916/
Here are some effects observed for type 1 deficiency, albeit in rodents: https://diabetes.diabetesjournals.org/content/64/2/447
Here is a study in humans about insulin sensitivity changes on dutasteride: 5αR inhibition with dutasteride, but not finasteride, impairs peripheral (principally muscle) insulin sensitivity, and increases body fat and leptin: https://www.endocrine-abstracts.org/ea/0031/ea0031oc1.5
I read it and I’m still a little baffled, is there a laymen’s guide to this? Or a specialist I can speak too