Thyroid Disorders Community
Hypothyroid and B12
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This patient support community is for discussions relating to thyroid issues, goiter, Graves disease, Hashimoto's Thyroiditis, Human Growth Hormone (HGH), hyperthyroid, hypothyroid, metabolism, parathyroid, pituitary gland, thyroiditis, and thyroid Stimulating Hormone (TSH).

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Hypothyroid and B12

Finally saw an endocrinologist yesterday.  He said that he couldn't believe that my GP doctor had not mentioned my B12 from my bloodwork.  He said I am below 200 and he said he feels that is VERY low.  He wants me to do b12 shots, but said I could start off with sublingual B12 for a couple weeks to see if it helps.
Do many of us hypothyroid people have B12 deficiency too?
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Avatar_m_tn
Hypo patients are frequently too low in the ranges for Vitamin B12, D, and ferritin, each of which is very important.  Most people do better with B12 in the upper part of its range, Vitamin D around the middle of its range, and ferritin around 80 for women.  Have you been tested for Vitamin D and ferritin?  Also, I recall previous posts from you.  Have you been tested for Free T3 and Free T4?  Please post here any additional results, along with their ranges.
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649848_tn?1357751184
You have quite a few threads going and I haven't been able to keep up with them all.  

What was the range for your vitamin B12?  Yes, less than 200 is low (according to most ranges) and you probably should start out on shots to get your levels higher......

The connection between low B12 and hypo/Hashi is that most B12 deficiency is Pernicious Anemia which is autoimmune; Hashimoto's is also autoimmune...... once you have one autoimmune disease, the chances of having another are greater.

Please post whatever thyroid levels you have, and per gimel, include reference ranges, which vary lab to lab.
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Avatar_f_tn
I have hypothyroidism.
Last year my B12 was in the 300's and the neurologist said from their standpoint they want it around 800.
We began the shots for about two months and now I just take B12 sublingually - sometimes I forget about taking it but I was recently tested and am at 742.  
I can't comment whether there is a link between hypo and a deficiency....just thought I would chime in my experience.  
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1756321_tn?1377771734
Hypothyroidism slows metabolism and this can cause the parietal cells to produce less stomach acid (hypochlorhydria). Adequate levels of stomach acid is required for vitamin B12 absorption.

Another cause for vitamin B12 deficiency is due to other autoimmune disease that may occur with Hashimoto's thyroiditis such as autoimmune pernicious anaemia or celiac disease.

Prevalence and relative risk of other autoimmune diseases in subjects with autoimmune thyroid disease. Am J Med.  2010; 123(2):183.e1-9 (ISSN: 1555-7162)...

"The frequency of another autoimmune disorder was 9.67% in Graves' disease and 14.3% in Hashimoto's thyroiditis index cases (P=.005). Rheumatoid arthritis was the most common coexisting autoimmune disorder (found in 3.15% of Graves' disease and 4.24% of Hashimoto's thyroiditis cases).

Relative risks of almost all other autoimmune diseases in Graves' disease or Hashimoto's thyroiditis were significantly increased (>10 for pernicious anemia, systemic lupus erythematosus, Addison's disease, celiac disease, and vitiligo)."
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