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

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 10¢ per day on D3 and K2 from Amazon instead of paying for 200,000 IU injections every month or two.