Vitamin B-1 (Thiamin)

In 2011 Martin Schwartz, Ph.D., emailed me about vitamin B-1. He’d dug up a 1951 study finding that thiamin helped children who stutter. Dr. Schwartz, who was Executive Director of the National Center for Stuttering, asked his adult clients to try thiamin. About a third stopped stuttering.

I tried 300mg thiamin. My speech improved within a few days. Two months later my speech deteriorated. It wasn’t as bad as before using thiamine, but it wasn’t much better. I was disappointed that the effect had “worn off” over time.

Then I remembered that I’d finished the first bottle of sixty tablets and ordered a new bottle. I looked and saw that the new bottle was 100mg tablets. I went back to 300mg and my fluency immediately returned. I’d done a double-blind study on myself!

The Hale Study

The 1951 study(1) was double blind AB/ABA design with observations over two months or more. The children received 30mg daily. The number of children wasn’t reported and stuttering wasn’t measured. The previous article in the same issue of the journal was about ways to measure stuttering. In other words, in 1951 measuring stuttering was just beginning.

The results of the Hale study were:

  1. 80% of the two- and three-year olds had “observably improved” speech.
  2. 50% of the four-year-olds “were definitely improved.”
  3. Little improvement was seen in the five-year-olds.
  4. No improvement was seen in the seven- and eight-year-olds.
  5. Four children did an ABA design study, with thiamin switching off their stuttering for a month, stuttering returning on the placebo for a month, and then thiamin switching off the stuttering again for a third month.
  6. Except for one child, all of the children who responded to thiamine did so within two weeks.

The diminishing effect with older children could be because two- and three-year-olds typically weigh about 30 pounds; when seven- and eight-year-olds typically weigh about 60 pounds, so the older children were getting about half the dosage.

The article also referred to an unpublished M.A. thesis(2) of 17 adults in which “the greatest speech improvement was observed during the periods of thiamin consumption as compared to those periods during which a placebo was administered.”

Vitamin B-1 foods

The Schwartz Study

Dr. Schwartz did a double-blind study(3) of 38 adult male stutterers. Half received about 350 milligrams of vitamin B-1 (three 100 mg pills, one with each meal, plus a daily B-complex pill). The others received placebos. Of the 19 men who received the vitamins, stuttering was “largely eliminated” in six of the men. For the other 13 men no effect was seen. The six men were then followed for seven months and “their speech has remained essentially free of stuttering.”

Adult men typically weigh about 190 pounds so these men received more than one milligram per pound of body weight, or more or less twice the dosage that was effective for the younger children in the Hale study.

The study was rejected by Nature because it didn’t follow formal procedures for registering human subjects and because a news release with the results had been released. The study wasn’t rejected for scientific reasons.

Dr. Schwartz now recommends taking magnesium with thiamin. A study(4) tested minerals in the blood of 53 stuttering children aged 5-12, and a control group of 22 non-stuttering children aged 6-16. Sodium, potassium, calcium and magnesium were tested. The only significant difference was found in magnesium. 47% of the stuttering children were low in magnesium. One of the functions of magnesium is in metabolizing B vitamins.

What the Experts Say

The stuttering experts get furiously angry at the mention of thiamin.

How Important Is Evidence Quality?

In my opinion, evidence standards can be lower for treatments that have no side effects, are inexpensive, and demand little or no time. If all you have to do is pick up a $5 bottle of vitamins at the drug store, the evidence we have is good enough to recommend trying thiamine.

In contrast, medications with harmful side effects, surgery, or lengthy, expensive therapy programs should be proven in large, high-quality studies before they are recommended.

The StutterSense Poll

An informal poll on the StutterSense blog found that of 22 stutterers who had tried thiamine, 36% said that it didn’t help, 36% said that it helped somewhat, and 27% said that they experienced a dramatic improvement in their speech.

What I Take

In 2013 I increased my dosage to 1200 mg and my speech improved, almost to complete fluency.

I’ve since backed down the dosage to where my speech is pretty good. I stutter mildly or I use a DAF/FAF device or if I ask a speech partner to remind me to slow down when I stutter. I take 100mg of thiamin five times a day (500mg total), plus I take 500mg magnesium.

There are different forms of thiamin. Some thiamin is fat-soluble and other thiamin is water soluble; some stutterers say that one works for them but the other doesn’t. I’ve tried both and I didn’t notice a difference. I take thiamin hydrochloride (HCl), the “regular” inexpensive vitamin B-1.

Magnesium also comes in a variety of forms. I’ve tried several and noticed no difference. I found two brands that each mix five forms of magnesium (citrate, taurinate, succinate, etc.). I have no idea whether any of these is better than the others, so I take one of each daily, to cover all bases.

Thiamin and magnesium

Safety of Thiamine

The Recommended Daily Allowance (RDA) of vitamin B-1 is 1.4 mg, i.e., the minimum amount needed for health. The maximum safe dosage is 7000 milligrams per day. That’s more than ten times what I take.

What Thiamine Does in the Brain

Thiamine’s role in the brain is beyond my area of expertise, but I’ll quote Paul Brocklehurst. Dr. Brocklehurst studied medicine for two years but had to drop out due to severe stuttering. Twenty-five years later he returned to university, earned a degree in speech therapy, and then in 2011 earned his Ph.D. with a dissertation on stuttering. He writes:

Of particular interest is the role that thiamine plays in maintaining cerebellar function and structure. Thiamine deficiency contributes to a reduction in the number and size of Purkinje cells in parts of the cerebellar vermis (Philips et al. 1987). Thus, thiamine deficiency can lead to clinical and subclinical manifestations of ataxia (poor spatial and temporal muscle co-ordination). The most common example of this (in adults) is related to excess alcohol consumption (alcohol can lead to thiamine deficiency). Also of interest, is the fact that thiamine plays a role in the production of and enzyme pyruvate dehydrogenase (PDH), which is needed for the production of myelin. Imaging studies have shown that some PWS have myelin deficiencies and/or impaired cerebellar function, so both myelin deficiency and cerebellar impairment could play a role in predisposing to stuttering.(5)

The following is from a paper about thiamine deficiency in alcoholics:

Thiamine is a helper molecule (i.e., a cofactor) required by three enzymes involved in two pathways of carbohydrate metabolism. Because intermediate products of these pathways are needed for the generation of other essential molecules in the cells (e.g., building blocks of proteins and DNA as well as brain chemicals), a reduction in thiamine can interfere with numerous cellular functions, leading to serious brain disorders.(6)

And there’s always Wikipedia:

the nervous system is particularly sensitive to thiamine deficiency, because of its dependence on oxidative metabolism…The brain requires a much greater amount of thiamine than in other cells of the body. Much of ingested thiamine never reaches the brain because of passive diffusion and the blood brain barrier.

If You Tried Thiamin and Magnesium and You Still Stutter

Many people have problems absorbing B vitamins. For example, caffeine interferes with thiamin absorption. Consult a nutritionist for a micronutrient panel and a microbiome analysis. The nutritionist may be able to solve your B-vitamin absorption problems.

(1) Hale, L. (1951). A consideration of thiamin supplement in prevention of stuttering in preschool children. Journal of Speech and Hearing Disorders, 16:4; 327-333.

(2) Penson, E.M. An exploratory study of the effect of thiamin hydrochloride on adults who stutter. M.A. thesis, Ohio Univ., 1951.

(3) Schwartz, M. Thiamin and Stuttering; a preliminary study. (accessed 2013 April 24)

(4) Schleier E, Schelhorn P, Groh F. (1991) Biochemical studies in stuttering in children. Otolaryngol Pol. 1991;45(2):141-4.

(5) Brocklehurst, Paul. 2013. RE:Vitamin B1 and stammering. [ASHA SIG 4]: SIG 04, Fluency and Fluency Disorders Digest for Friday May 10, 2013

(6) Peter R. Martin, M.D., Charles K. Singleton, Ph.D., and Susanne Hiller–Sturmhöfel, Ph.D. 2004 The Role of Thiamine Deficiency in Alcoholic Brain Disease.

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