Hey ,

It depends a little bit on what you would like to know. If you would like to find out what health your thyroid/body is right now, you could do all those tests before.

The blood test result in Oktober showed that your ferritin levels dropped compared to the ferritin levels from March. Right now, your iron levels might have fallen further, which can further interfere with thyroid hormone function.

If you would like to avoid this conclusion, I would use at least an iron supplement first for a while. Liquid iron formulas can be easier to absorb in the body. They are also better to dose.

The multivitamin with iron has 45 mg of iron in it. This is quite high. Although the form of iron (iron bisglycinate) is usually not constipating there is some discussion about how iron causes constipation. If the iron isn’t well absorbed (for example because of inflammation in the gut) iron is excreted in the stool. More iron in the stool will cause it to retain less water, thus making the stool drier and perhaps harder to move along. 

The product from Thorne has no iron in it, but it is quite high in folate. Since you are already using a B complex for a while, I wouldn’t recommend that as well. It is even quite high without using an additional B complex.

I would perhaps choose a basic nutrients 2/day from Thorne:
• It is higher in methyl-folate than the often-used 400 mcg in other multivitamin formulations.
• It doesn’t contain iron. It is easier to combine with a liquid iron supplement.
• One dose is 2 pills per day. Since vitamin B12 is bound to a transport protein called Haptocorrin that is produced in saliva and the stomach, the limiting factor for absorption can be the amount of Haptocorrin you make during the digestion of a meal. Dividing the pills with 2 big meals you can absorb more of the B12 in the pill.

Once you have used a vitamin pill for a while you can also rule out the option that nutrients weren’t in your diet. If a nutritional deficiency would present in a nutritional blood test, we can also conclude more easily that we are dealing with an absorption issue.

Once you do the thyroid test, you have to stop taking the vitamin pills a few days before the test though. The pills contain biotin, which can interfere with the results of the thyroid labs