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I have a 17 year old son who has been supplementing with Vitamin D3 without much increase in levels. He is not overweight (6 feet tall and around 150 lbs) and is not dark skinned. We live in New Mexico at the high altitude of 7,500 ft. We bought vitamin D test from the vitamin D council. He first tested April 25th with a result of 45.3. He started taking 14,000IU per day and I encouraged him to get in the sun. On July 14th, he tested again with a result of 48.2. After this test result, we switched to a VitD3/K2 supplement and increased his dosage to 20,000IU of D3 per day taken with fat (usually a spoonful of coconut cream concentrate). The K2 is 15mcg per drop and he was taking 10 drops — for the 20,000 IU of D3 and 150 mcg of K2/M7. He tested his vitamin D level a third time on October 12th with a result of 42.4. I assume that the drop in his levels are due to less sun exposure. He does not seem to be absorbing the D3 adequately from the supplement and so I hesitate to go even higher until we have explored other reasons his levels aren't increasing. I am purchasing a separate K2/M4 supplement, brand Thorne with 1mg of K2/M4 per drop. Are there any other co-factors that he might need or would aid in absorption? His only health issue is itchy feet. The severity is terrible in winter but reduces greatly in summer. The seasonal aspect is what made us think of Vitamin D, especially since many other possibilities have been eliminated (such as specific footwear, fungus, athlete's foot, food allergies, etc.). Hopefully his condition would be helped by increasing Vitamin D3 levels into the 60s and then sustaining that over the long term. Thank you for any advice you may have.

Asked by  worleys4liberty20673700 on October 30, 2017

  •  worleys4liberty20673700 on

    See title

    Answered by  worleys4liberty20673700 on
  •  IAW on

    You could start with Harry’s list at https://www.vitamindwiki.com/Reasons+for+low+response+by+vitamin+D+level+in+the+blood. Although I knew that Vitamin D uses a lot of magnesium, he says that Vitamin D will not absorb correctly if you are low in magnesium.
    You did not say he has any type of “gut issues” that may affect absorption.For people that do, though, oral Vitamin D sprays work really well.
    If you end up trying some of those things and do not have any luck with levels increasing, come back and tell me.

    Answered by  IAW on
  •  worleys4liberty20673700 on

    Thank you! I will look into all of the ideas on that chart. He was taking magnesium and probiotics at one point, but he’s not any more. I’ll start that back and have him take it at the largest meal of the day. He does not have any known gut issues I’ll also look into the spray and/or water-based vitamin D.
    As for the ‘common’ reasons, he
    – does not have excess BMI/weight
    – does not smoke
    – is not on a low-fat diet
    – does not drink sodas
    – is not on a low-cholesterol diet
    As I said, I’ll add magnesium, have him take it at the largest meal of the day, and look into non-oil based vitamin D. We are using a D3 (Maxx Labs) that is in olive oil, which the chart says could reduce absorption by 25%, so we’ll look for an alternative.

    As for the ‘Sometimes’ and ‘Rare’ causes,
    – his only health issue is itchy feet
    – anemia seems unlikely
    – fatty liver seems unlikely (he doesn’t drink alcohol or consume much sugar)
    – he doesn’t take any drugs
    – he is taking D3 (rather than D2)
    – he doesn’t get too much UVA, I don’t think
    – he *was* born in the winter
    – he doesn’t have any gut problems
    – we are eating more organic, but not completely (in reference to pesticides)
    – we try to avoid plastics
    – no vitamin A supplementation
    – no gallbladder removed
    – no bariatric surgery
    – no pancreatic insufficiency (that I know of)
    – no liver problems
    – no burned skinned
    – not dark skinned
    – not elderly
    – no known kidney problems

    Thank you very much for the reference to that chart and your advice! I’ll report back after trying these changes and taking another test.

    Answered by  worleys4liberty20673700 on

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