Never heard of primo making somebody feel tired like that, but I always take people’s personal experience to heart when talking about whatever compound. Maybe it’s the AI effect dht's can possess? Idk, in my eyes it’s a nearly perfect compound I’ve always been super interested in it and it’s purported effects on the immune system and all that jazz. Why do you think it has that effect on you, personally? Do other DHT derivatives make you feel as such, or most of them, rather? Other than making ya lethargic did you have a mostly positive experience with it as well?