My iron is too low! My B12 isn’t optimal! My Vit. D is the pits!

A huge revelation over the years by hypothyroid patients is that we tend to have poor absorption issues, resulting in low levels of key nutrients. And when we bring them back up, we’ve learned the hard way that we have to stay vigilant to keep them up.

Here is a list of seven reasons you might find yourself with low levels, or might see them drop again…


This is by far the most common reason each thyroid patient should explore.

Having continued hypothyroidism (whether due to being on T4-only meds, being underdosed on NDT, being held hostage to the TSH, having low cortisol, etc) results in low levels of stomach acid for all too many. You “dry out” on the inside!

And why is that problematic? Because you need stomach acid for nutrients and micro-nutrients to be absorbed well, to help with the digestion of protein, to kill bacteria and yeast, and to assist your stomach to empty correctly. The right amount of acid will even stop acid reflux (doctors tend to assume that acid reflux is from too much acid, but low stomach acid is usually the culprit for thyroid patients).

The solution has been to add one tablespoon of Apple Cider Vinegar (Braggs is a popular brand, but there are others) or lemon juice to your morning juice or water and drink down your supplements with that mixture. Even adding an acid to any drink you consume with each and every meal helps.

Or take man-made hydrochloric acid supplements when you take supplements and each time you eat. Betaine HCL is a well-known brand, but there are others.

And guess what: aging doesn’t help with the production of stomach acid, either.

Read more about all this here.


Long-term low stomach acid as explained above can also cause an imbalance of your yeast levels, which in turn can make nutrient absorption worse, reducing the “absorption surface area” in your small intestines.

You are also at a higher risk of a yeast problem if you have used a lot of antibiotics, eat a lot of sugar or white flour products, over-consume alcohol, have an impaired immune system, have SIBO (small intestinal bacterial overgrowth), or have been on long-term birth control meds.

Symptoms of a yeast problem are pretty diverse, ranging from fatigue, sugar or carb cravings, irritability, feeling bloated, constipation, white coating on your tongue, itching around your vaginal opening, vaginal white discharge above and beyond what is normal, and more symptoms.

To see if you have a yeast problem (and for women), your doctor can take a sample from your vagina and do a quick analysis. Or blood testing of the antibodies IgG, IgA, and IgM can discern a yeast problem. Or ask about the Organic Acids Test (OAT) which will reveal specific chemicals which would only be in your urine in the presence of Candida.

Dr. Mercola has a great page on holistic ways to treat candida (if you can stand the irritating pop-up)


Celiac is a immune reaction against the gluten you eat. The inflammation and damage to your intestines caused by Celiac disease can result in nutrients not being absorbed well, or speeding right through you via diarrhea, unabsorbed. i.e. Celiac causes the villi in your intestine (those tiny finger-like projections) to be inadequate in getting in all those nutrients. If you catch your celiac soon enough, this damage can be reversed!

Even those without Celiac but confirmed gluten intolerance can see issues with nutrient absorption due to the chronic internal inflammation that gluten foods can cause. Like Celiac, one has to be committed to removing gluten from their diets.


This genetic mutation of the enzyme “methylene tetrahydrofolate reductase, aka MTHFR” will tend to negatively affect the conversion of the inactive forms of Folic Acid (B9) and B12 to the active levels (Folate and methyl B12, for example…thus a chronically low level of these nutrients.

You can ask your doctor for a lab test to determine if you have a MTHFR enzyme mutation, which will be the “C677T” or the “A1298C” genes…or both.

“Repairing the digestive system and optimizing the flora should be one of the first steps in correcting methylation deficiency” says Dr. Ben Lynch in his blog post from the MTHFR website. But those of us with methylation mutations also need to be on supplements like methyl B12, folate and P5P (B6) and more.


Turns out this isn’t just a third world problem. We can have those pesky little, uninvited invaders if we have traveled overseas or eaten food that came in from other countries. And they cause inflammation in your digestive tract, which hinders the absorption of your iron, vitamins and more. Parasites can also cause a yeast overgrowth–another absorption issue.

You can suspect parasites if you have gas, diarrhea or constipation, yeast infections, depression, weight gain and difficulty losing and more. Note these are similar to other issues above, and some in common with being hypothyroid. So testing will be important to rule this out or not.


This happened to Janie Bowthorpe once upon a time. She was using high doses of calcium to remove excess oxalates from her body, and ended up with miserably low iron. i.e. calcium interferes with iron absorption.


Probably the most rare of reasons above, but it can happen. Undiagnosed bladder cancer (or other related organs) can cause this, as can taking too much aspirin, being in an automobile accident, ovarian cysts, and even a severe Vit. K deficiency.

Important notes: All the information on this website is copyrighted. STTM is an information-only site based on what many patients worldwide have reported in their treatment and wisdom over the years. This is not to be taken as personal medical advice, nor to replace a relationship with your doctor. By reading this information-only website, you take full responsibility for what you choose to do with this website's information or outcomes. See the Disclaimer and Terms of Use.