U.S. doctors online nowAsk doctors free
Top answers from doctors based on your search:

Is it better to take vitamin d once or twice a day

A 31-year-old female asked:
Family Medicine 16 years experience
Depends: Really depends on whether or not there is deficiency. As a supplement for osteoporosis prevention 800iu daily should be adequate. Otherwise any defi... Read More
Dr. Daniel McGee
Family Medicine 17 years experience
It depends: The institute of medicine sets recommended dietary allowance(rda) at 600 iu for people ages 1-70 with safe upper limits for daily intake ages 9 & abov... Read More
Dr. Frederick Singer
Endocrinology 59 years experience
Vitamin D intake: Vitamin d intake depends on what the level of serum 25ohd is in the blood. The average normal person should take at least 1000 u of vitamin D3 daily.

90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more. Get help now:

Ask doctors free
Educational text
Talk to a doctor
24/7 visits - just $39!
50% off with $15/month membership
A 46-year-old member asked:
Dr. Michael Kleerekoper
A Verified Doctoranswered
Endocrinology 52 years experience
Vitamin D: One tablet a day, purchased over the counter at 1000 or 2000 units per tablet and neither is expensive. My wife and I each take the 1000 and are just... Read More
A 38-year-old member asked:
Dr. Terri Washington
Endocrinology 17 years experience
Does not matter: It does not matter when you take vitamin d, sometimes taking after food can help if it causes stomach upset.
A 47-year-old member asked:
Dr. Thomas Namey
Rheumatology 49 years experience
If not deficient...: I recommend between 2000iu of d3 to 5000iu of d3 per day. I take 5000iu! however, with serious deficiency you may need 50k iu of prescription d2 twi... Read More
A 32-year-old female asked:
Dr. Albert Pizzo
Family Medicine 61 years experience
Vitamin D: Depends on many factors e.g. Age, amount of skin exposed to sun rays daily, use of sun blockers, time of day that skin is exposed, race, location, and... Read More
A 39-year-old female asked:
Dr. Kenneth Merriman
Orthopedic Surgery 48 years experience
NO: In usa all d you can get otc is d3 i usually recommend 1000 iu per 25# body wt therefore 100 # person would take ~ 4000 iu/day go to vitamindcounci... Read More
A 31-year-old member asked:
Dr. Jose Barreto
Physical Medicine and Rehabilitation 15 years experience
Check other sources: First you should visit your doctor for an evaluation. Then, depending on your current vitamin d level and medical situation, take vitamin d accordingl... Read More
A 17-year-old male asked:
Dr. Michael Kleerekoper
A Verified Doctoranswered
Endocrinology 52 years experience
Vitamin D: If you are African-American you rarely need vitamin D. If you are non-Hispanic white you don't need vitamin D during late spring and summer but later ... Read More
A 39-year-old male asked:
Dr. Michael Kleerekoper
A Verified Doctoranswered
Endocrinology 52 years experience
Vitamin D: 7000 units per day is unnecessary. 1000 units per day should suffice. 7000 units once every week is also OK.
A 51-year-old female asked:
Dr. Clarence Grim
Endocrinology 58 years experience
The real issue is do you need Vit D at all. Most do not. Discuss with your dr.