thiamine plus magnesium

Why Thiamine Supplementation Requires Magnesium

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In this article, we will briefly examine some of the reasons why supplementing with the mineral magnesium is often essential when repleting thiamine, and also when using higher doses to support health conditions. In a minority of people, intolerance of magnesium supplements might be resolved when using thiamine simultaneously.

First of all, thiamine and magnesium are closely paired biochemically speaking. Magnesium is either directly or indirectly involved in the activity of numerous thiamine-dependent enzymes. Importantly, the activation of thiamine inside the cell greatly depends upon sufficient magnesium stores.

Thiamine Activation Requires Magnesium

thiamine activation by magnesiumAfter absorption, dietary forms of thiamine gain entry into the cell through transport proteins. Once inside, free thiamine must be converted (or “activated”) into thiamine pyrophosphate (TPP), the biochemically active coenzyme form. This is achieved by an enzyme called thiamine pyrophosphokinase, which removes a phosphate from adenosine triphosphate (ATP) and attaches it to thiamine to make TPP. This enzymatic reaction has been shown to require a divalent cation, which in most cases is magnesium.

This is especially important when using supplements with the aim of rapidly increasing intracellular thiamine levels, because the above “activation” process will increase the requirement for magnesium. Without enough magnesium to meet this demand, it is at least theoretically plausible that there will be less active TPP which can be utilized.

The Transketolase Enzyme

Likewise, the transketolase enzyme located within the pentose phosphate pathway also requires magnesium to undertake its activities. Research has shown that both magnesium and thiamine alone are capable of increasing transketolase activity.
thiamine transketolase pentose phosphate pathway

Alpha-ketoglutarate Dehydrogenase and Pyruvate Dehydrogenase

Magnesium ions were shown to directly increase the activity of the thiamine-dependent rate-limiting alpha-ketoglutarate dehydrogenase complex (KGDH), an enzyme unit involved in the Krebs cycle (part of the larger process of generating cellular energy). Research indicates that KGDH requires both TPP and magnesium for maximal activity.


Furthermore, a similar thiamine-dependent enzyme complex positioned at the interface between glycolysis and the Krebs cycle called the pyruvate dehydrogenase complex (PDHC) also requires magnesium, but indirectly. The PDHC is essential for carbohydrate metabolism. Although magnesium ions do not directly interact with the PHDC, they do exert significant influence on a related regulatory enzyme called pyruvate dehydrogenase phosphate phosphatase (PDHP). Magnesium activates PDHP, and PDHP is responsible activation of the PDHC. Hence, thiamine directly increases PDHC activity, and magnesium indirectly increase it as well.

Thiamine and Magnesium Should Be Supplemented Together

With the numerous interrelated roles of these two nutrients taken into consideration, is it any wonder that research has demonstrated negative consequences of supplementing one without the other?

One animal study showed that thiamine supplementation in magnesium-deficiency (and/or sulfate deficiency) resulted in reduced thiamine concentrations in liver and elevated triglycerides, suggesting a role for magnesium in liver retention of thiamine. Another study looking at thiamine supplementation in magnesium deficient animals found that the addition of thiamine results in a significant decrease in blood and bone concentrations of magnesium, which indicates an increased demand for magnesium and depletion of the stored mineral. The same study showed a lower levels of thiamine in nerve, liver, and kidney of magnesium deficient animal, providing further support for magnesium’s role in thiamine retention. Additionally, they showed that thiamine could not increase transketolase activity in the presence of magnesium deficiency.

Correcting Wernicke Encephalopathy, the end stage neurological consequence of severe thiamine deficiency with thiamine alone was found to be ineffective in one case report, and only after correcting hypomagnesaemia (addressing magnesium deficiency) did the patient’s transketolase normalize and symptoms resolve. A more recent report showed the same results.

So to conclude, it is clear that magnesium is absolutely essential for normal thiamine activity in the body, and one should take great care to ensure sufficient intake when addressing underlying thiamine issues. This is especially important when consistently using high doses.

Magnesium and Thiamine

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This article was published originally on October 25, 2021. 

Elliot is a nutritional therapist and functional medicine practitioner based in the UK. He runs a private nutritional practice called EONutrition and consults with people virtually from around the globe.

Elliot originally developed a keen interest in the clinical application of thiamine TTFD after reading "Thiamine Deficiency Disease, Dysautonomia and High Calorie Malnutrition. After applying high doses of this nutrient in clinical practice and witnessing the immense benefits it could provide, he now seeks to raise awareness of its therapeutic potential through educating others.


  1. Excited to share that I also discovered the incredible synergy between thiamine, magnesium, and vitamin C! I am currently developing a special supplement specifically designed for day traders to boost focus, reduce stress, and enhance overall performance.
    There are so many supplements with a lot of ingredients, I decided to keep it super simple and just put the things together that actually work.
    I can’t wait to let people try out the supplement so they can tell me what they think!

  2. I have been taking 200-300 milligrams calcium glycinate, daily. It has been very helpful for my sleep and constipation. I just began taking benfothiamine. I feel I am losing some of the benefits of the magnesium. How much should I increase my magnesium intake? When I take too much magnesium I am kept awake a night with irregular heartbeat, but this may not be the case if I am taking benfothiamine. Thank you.

    • That’s the problem I have with thiamine and magnesium, they both give me shortness of breath and weird heartbeats, used individually or together! Nobody seems to be able to answer this question.

  3. This important article/advice ignores the most important facts…”one should take great care to ensure sufficient intake when addressing underlying thiamine issues. This is especially important when consistently using high doses.”
    “sufficient intake”?
    “high doses”?

    OOPS, just occurred to me you might be selling something!?

    • How dare he try and make a good product that has no fillers or flow agents at a reasonable price because he found that it was lacking in the market and he found it to be incredibly beneficial to so many people struggling to find good health! I for one, am so grateful and so are many of my clients. Have you seen how much free content Eliot has put out for the benefit of the public? He deserves to get paid for his service unlike other non-contributing zeroes.

  4. I take 2 per day of 500 mg B1 with carbidopa/levodopa for Parkinsons. I found 2 forms of Magnesium, Bisglycinate and L-Theronate. Which would be appropriate?

  5. I could lost in the Hormones Matter content for hours on end. These articles are utterly fascinating. I appreciate you all!

  6. I have tested your product Thiamax with kinesiology alongside Allithiamine, Benfothiamin, and Thiamine HCL

    It has shown by far the strongest signal, and a current dose of 3x 25mg daily, or 2x Allitiamine 50 mg

    Additionally, Magnesiumphosphate and reMag from Dr. Dean are testing stronger than other forms of Magnesium

    Maybe kinesiology could help, to find out the right dose at a time, and prevent the paradoxical reaction?

    From my own experience, Magnesium deficiency, high carbs diet, moderate alcohol and hard physical activity together can lead to WE-Korsakoff , and reverses the symptoms to normal after 4-5 hours after supplementing 3 grams af magnesium, in contrary to all the pharmaceutical drugs, who do n o t help, but cause further d a m a g e / can lead to death (I was several times close to it, minutes if not seconds)

    There was the German Olympic Gold medal winner Bane Rabe i(rowing), who finally died after a similar mix of intense physical activities , moderate alcohol consumption, psychosis and wrong treatment of psychosis with pharmaceutical drugs. And probably thiamine / magnesium deficiency ?

    Thank you for your videos of high value! Very eye opening and comprehensive!

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