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Information on the latest vitamin D news and research.

Find out more information on deficiency, supplementation, sun exposure, and how vitamin D relates to your health.

Hello there, I just got my Vitamin D test result today, and it was at 17. No wonder I feel so depressed. I was kind of surprised because I have been taking 4,000UI of D3 for at least 6 months. I have 2 questions for you: 1. Why do you say that magnesium oxyde is not good? I have been taking this kind of magnesium for years. 2. Since July, I have a Morton's neuroma on my left foot coupled with a tendonitis, and it just does not want to heal. Do you think that the slow healing as anything to do with my low Vit D level? I am so happy I found this forum. I think the information presented here make a lot of sense. Thank you!

Ask the Vitamin D Council

Asked by  nicoler23413057400 on October 3, 2016


  • nicoler23413057400
     nicoler23413057400 on

    See title

    Answered by  nicoler23413057400 on

  • IAW
     IAW on

    Magnesium oxide is what we call “not as bioavailable” as other forms of magnesium. In layman’s terms less of it reaches your bloodstream and therefore less of it is available for your tissues and bones. It does not mean that none reaches your bloodstream but a lot less does compared to other forms of magnesium.
    Yes, slow healing could very well be caused by the low levels.
    I will assume the 17 was measured as ng/ml and not nmol/l. One reason you may still have a low level is if you weigh a lot more than 150lbs. If you weigh more, you will have to take more. Another reason may be poor absorption if you have any kind of intestinal issues. A third reason is if you have any medical issues other than depression and the foot issue. (The depression should disappear at higher levels.)
    If you have been reading this website than you know we believe in maintaining a “healthy” level of 50ng/ml (125nmol/l). At levels below 40ng/ml your chance for cancer or autoimmune disease increases dramatically.
    Without any more information it looks like you should at least double your dose but I think you will have to go to 10,000iu a day!
    Let me know if you have any more questions!

    Answered by  IAW on

  • nicoler23413057400
     nicoler23413057400 on

    Yes, 17ng/ml.
    I am 5’8″ and weigh 135lb, so hopefully I should be ok with 10000UI/day.
    Thank you so much for all the info regarding the magnesium.
    I will go buy another kind tonight.
    I love your website. Thank you for setting this up for us!

    Answered by  nicoler23413057400 on