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What would be a good start for taking magnesium along with vitamin D3?

Hi, In a perfect world.  What would be a good start for taking magnesium along with vitamin D3?  I am on synthroid and Cytomel at the moment.  Thank you for your help!
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Have you been tested for magnesium and Vitamin D?  If so, please post results.  Also, what symptoms do you have, if any?  What are your Free T4 and Free T3 levels and daily doses of Synthroid and Cytomel?
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No I haven't been taking magnesium or vitamin D. I bought a bottle of magnesium at Costco but the dosage seems pretty high.  I am always tired, my hair falls out constantly, suffer from constipation or have to watch everything I eat so I don't gain weight.  Being extremely cold at night has gotten much better since I started taking Cytomel.  These are my test  results. T3 2.4, TSH 1.38 and Free T4 .99.  Synthroid is 100mcg and 5 mg of cytomel twice a day.
What are the reference ranges shown on the lab report  for the Free T3 and Free T4?
Reference labs are T3Free 2.0 -4.4 , T4 .82-1.77  Standard 450.4.5  Thank you!
with those symptoms the test results confirm that you are still hypothyroid and need to increase your med dosage.  Your Free T3 of 2.4 is only about17% of its range and your Free T4 is only about 18% of its range, both of which are too low for most people.  The ranges are far too broad due to the erroneous way they are determine by the lab.   The ranges are not what is called adjudicated ranges which are based on some professional group's opinion  of what levels are optimal for health.  Instead the ranges are determined by each lab,  based on a database of test results that excludes only those with high TSH.  This means that clinically hypothyroid patients with TSH within range, patients with central hypothyroidism, and patients already being treated with thyroid med are all included in the database used to calculate the ranges.  This practice results in ranges that are too broad, and skewed to the low end.  Many of us have found that we needed FT4 and fT3 around 67% of the range, or if taking NDT med, then FT4 around mid-range, and FT3 in the high end of the range.  Also note that you should always delay your morning thyroid med until after the blood draw for FT4/FT3 tests in order to avoid false high results.  

Along with that you also need to make sure your Vitamin D, B12 and ferritin are optimal.  S should be at least 50 ng/mL, B12 n the upper end of its range and ferritin should be at least 100.  All 3 are important due to their effect to your body's response to thyroid hormone. If never tested for cortisol that should be done at least once to assure adequacy.  

If you want to confirm anything I have said, click on my name and then scroll down to my Journal and read at least the one page Overview of a full paper on Diagnosis and Treatment of Hypothyroidism:  A Patient's Perspective.  There are numerous references to supporting scientific evidence.
I should have also reemphasized that everyone is different in their needs for FT4 and FT3, so there cannot be any hard targets.  Dosages must be always adjusted as needed to relieve hypothyroids symptoms, without creating any evidence of hyperthyroid symptoms.    
1756321 tn?1547095325
Avoid magnesium oxide. That is pretty useless. I tried it out. I was taking magnesium chelate capsules but that is too effective for me lol (developed kidney failure on low dose - my kidneys are not up to scratch apparently no doubt due to insulin resistance). So I switched to my current magnesium citrate in tablet form and not every day. I take vitamin D3 capsules. Usually 3000 IU a day.
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Thank you for your help. I wasn't sure how much magnesium I should start with.
I'm not an expert on dosages. I just take what I need to relieve symptoms.  Dr Hyman wrote an article about magnesium - "Magnesium: Meet the Most Powerful Relaxation Mineral Available." Here is his comments on supplementing...

"The RDA (the minimum amount needed) for magnesium is about 300 mg a day. Most of us get far less than 200 mg.

Some may need much more depending on their condition.

Most people benefit from 400 to 1,000 mg a day.

The most absorbable forms are magnesium citrate, glycinate taurate, or aspartate, although magnesium bound to Kreb cycle chelates (malate, succinate, fumarate) are also good.

Avoid magnesium carbonate, sulfate, gluconate, and oxide. They are poorly absorbed (and the cheapest and most common forms found in supplements).

Side effects from too much magnesium include diarrhea, which can be avoided if you switch to magnesium glycinate.

Most minerals are best taken as a team with other minerals in a multi-mineral formula.

Taking a hot bath with Epsom salts (magnesium sulfate) is a good way to absorb and get much needed magnesium.

People with kidney disease or severe heart disease should take magnesium only under a doctor’s supervision."
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