This vitamin has been hailed for its health benefits. Among other things, it may also heal hypothyroidism.
But a new study in the journal BMC Endocrine Disorders recognizes that all previous studies on this vitamin and hypothyroidism were small and unreliable.
So these researchers conducted a big study to put this vitamin to the test.
The answer? It works for some but not for others!
These researchers were particularly interested in the autoimmune version of hypothyroidism, where your thyroid is destroyed by your immune system, which mistakes it for something that might be harmful.
This is a pretty important question, because we often believe that autoimmune disorders are beyond our control.
They used data collected by the National Health and Nutrition Examination Survey between 2007 and 2012. They analyzed data from a subset of 7,943 adults with an average age of 47.
They categorized the subjects’ Vitamin D levels as optimal (30 or more ng/mL), intermediate (20-30 ng/mL), or deficient (less than 20 ng/mL).
Within their subset, 614 of the subjects (7.7%) had autoimmune hypothyroidism.
What did the data tell them?
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1. 25.6% of those with hypothyroidism were deficient in Vitamin D, while only 20.6% of those without hypothyroidism were.
2. Compared to those with optimal Vitamin D levels, those with intermediate levels were 70% more likely to have hypothyroidism.
3. Compared to those with optimal Vitamin D levels, those with deficient levels were 60% more likely to have hypothyroidism.
This shows that Vitamin D deficiency is definitely a risk factor for autoimmune hypothyroidism.
Based on these findings, the researchers recommend that populations at risk of hypothyroidism should have their Vitamin D levels checked and should be given supplements if necessary.
However, if your Vitamin D levels are not too low, there is no benefit from taking extra Vitamin D supplements.