I am 6'4" (193 cm) and 240 lbs (108 kg). A big boy. I require supplementation at 5000IU to maintain ~48 ng/mL, which is just about normal.
It is impossible, at my latitude, to obtain adequate exposure to sunlight. I tried that.
My doctor said "hmmmm your vitamin d is 9... maybe that explains the all-appendage tendonitis and muscle soreness" and recommended supplementation. I really like being able to spend 10ยข per day on D3 and K2 from Amazon instead of paying for 200,000 IU injections every month or two.
It is impossible, at my latitude, to obtain adequate exposure to sunlight. I tried that.
My doctor said "hmmmm your vitamin d is 9... maybe that explains the all-appendage tendonitis and muscle soreness" and recommended supplementation. I really like being able to spend 10ยข per day on D3 and K2 from Amazon instead of paying for 200,000 IU injections every month or two.