 [ Symptoms ] what is causing me to be tired all day everyday  i have been experiencing chronic fatigue for years and no dr has ever been able to help i am a 28 year old male of average weight and height i can sleep for more than 12 hours a day if i am allowed to do so i have tried to sleep 6 7 hours 9 10 hours and everywhere in between but i can never shake this tired fatigued feeling that lasts all day  i do have somewhat low testosterone at 375 but it is not terribly low i have had sleep tests that did not reveal anything either what should i do [ Disease ] there is no collagen product that when applied to the skin will penetrate and remain as intact collagen the molecule is simply too large however topical collagen can be a really good moisturizer products with retinoids like retinol or retinyl propionate can affect deeper layers of skin by stimulating collagen production