If you have a vitamin D prescription, be sure that it is for D3
Most likely a prescription is for D2, not D3
Most 50,000 IU prescriptions around the world are still filled with D2
Some prescriptions specify 50,000 IU of D3, which has been available in the US since about 2000
D2 has proven to be not as effective as D3 and actually CAUSE many health problems
http://www.easy-immune-health.com/vitamin-d-50-000-iu.html
I (founder of Vitamin D Life) have been taking Bio-Tech Pharmacal 50,000 IU D3 for over 5 years now.
I take one every 4 days in winter, every 5 days in the summer
It is available over-the-counter, on the web, and can be prescribed in many countries.
Bio-Tech Pharmacal D3 is ConsumerLab.com Approved for Vitamin D
There are 5+ suppliers for 50,000 IU of D3 - any of which you can get without a prescription
Note: some websites took this information and (mis) stated that you should not take any form of 50,000 IU of vitamin D
See also Vitamin D Life
How often might 50,000 IU vitamin D be taken - results of clinical trials
One pill every two weeks gives you all the vitamin D most adults need
- Do not stop vitamin D after 8 weeks. Continue to take 50,000 IU once every 2 weeks for life
Overview Loading of vitamin D take 4-10 of the 50,000 IU capsules within a week
Near the end of pregnancy 50,000 IU vitamin D weekly was great – RCT April 2013
Migraine headaches reduced with 50,000 IU vitamin D weekly – RCT July 2015
Guideline following hip fracture – 50000 IU vitamin D daily for 7 days – Jan 2013
Diabetes treated if given enough vitamin D (example: 50,000 IU weekly) – review of RCT - Jan 2017
50000 IU vitamin D daily toxic after 3 months – Oct 2011 - unless balance cofactors