In case anyone is wondering, there are 2 units of measurement for vitamin D, ng/mL and nmol/L
The UK tests tend to use nmol/L and the US ng/mL
To convert nmol/L to ng/mL divide by 2.5.
e.g. 75 nmol/L would give 75/2.5 = 30 ng/m
If you are having trouble getting your doctor to agree to a vitamin D test, you can send your own to an NHS (UK) lab:
http://vitamindtest.org.uk/index.html
According to Dr Stasha Gominak, the sweet spot is between 60ng/mL and 80ng/mL (150nmol/L and 200nmol/mL)
She has more information on her site:
http://drgominak.com/vitamin-d-hormone.html
I have recently bought a UVB lamp. I can tolerate supplements, but I've been taking them for 5 years and they haven't made any difference to my health. When I had my levels checked they were "undetectable" which is what made my start taking supplements in the first place. I currently take 5000IU a day.
Discovering that vitamin D is a hormone and not a vitamin has made me think that taking supplements probably isn't the best way to go anyway. I wouldn't mess about with thyroxine unless I had a doctor regularly checking my levels, so I shouldn't be doing the same with vitamin D.
I've only been using the lamp for a few days, but I have been feeling a lot less tired. However, it's too soon to tell whether this is just a coincidence.
This is the lamp I bought.
http://www.amazon.co.uk/Care-Lamps-Psoriasis-Narrowband-deficiencies/dp/B00IHMANTG/
I've attached the vitamin D instructions they sent me in case someone would like an idea of what to expect.