When you're old!: There are 2 reasons to take vitamins: to treat symptoms of deficiency or prevent disease. If to treat symptoms you'll know if you feel better over time (many take several weeks), If for prevention when you reach 90 you will know. You can get a blood test to measure D levels- normal is at least 30, optimal 50-80; and take more D if needed. See https://tinyurl.com/y8nbzbo4
Answered 5/20/2018
324 views
A doctor has provided 1 answer
A doctor has provided 1 answer
4 doctors weighed in across 2 answers
2 doctors weighed in across 2 answers
90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more.
Ask your question