Benfotiamine is a synthetic version of thiamine, also known as vitamin B1, which is essential for many of the body’s functions including strengthening the immune system and protecting the brain. Benfotiamine is especially useful for protecting the body from the harmful byproducts of too much sugar and improving symptoms of diabetes and Alzheimer’s disease. Keep reading to learn more about this powerful supplement.

What Is Benfotiamine?

Benfotiamine is a fat-soluble derivative of thiamine (vitamin B1) that is more easily absorbed through digestion [R].

Benfotiamine is altered by gut enzymes (phosphatases) and then broken down into thiamine by red blood cells or in the liver [R].

Taking a benfotiamine supplement increases blood levels of vitamin B1 five times as much as an equal dose of thiamine [R, R].

Mechanisms of Action

Benfotiamine works by:

  • Activating the enzyme transketolase, a necessary part of the pentose phosphate pathway that turns sugars into sources of energy instead of harmful advanced glycation end-products (AGEs) [R, R, R, R]
  • Changing the production of specific enzymes (Nos3, PKB/Akt) to increase cell regeneration and reduce cell death [R, R, R, R]
  • Altering how energy is used in cells to enhance healthy growth and suppress cancerous growth [R, R, R]
  • Decreasing inflammation in brain cells and white blood cells [R, R]
  • Inhibiting the GSK3b gene, which improves brain health [R, R]
  • Inhibiting the NOX4 gene, which improves the breakdown of sugar in muscles [R].

Health Benefits of Benfotiamine

1) Benfotiamine Improves Complications from Diabetes

Benfotiamine increases both insulin levels and the breakdown of sugar for energy while slowing and maybe reversing complications caused by high blood sugar [R, R].

The most well-studied benefit of benfotiamine is in improving nerve damage that causes weakness, numbness, and pain (neuropathy) in diabetics.

In a study (DB-RCT) of 165 diabetic patients with neuropathy, benfotiamine for 6 weeks improved nerve damage [R].

Another study (DB-RCT) of 24 diabetic patients with neuropathy, 12 weeks of benfotiamine supplementation improved symptoms of neuropathy, including pain [R].

However, a long-term study (DB-RCT) in 59 type 1 diabetics found that benfotiamine supplementation for 24 months did not improve nerve function or reduce inflammation [R].

Benfotiamine also reduced the pain caused by inflammation and nerve damage in diabetic mice [R].

Daily supplements of benfotiamine protected 13 diabetic patients from the harmful effects of a meal that contained high levels of AGEs by reducing free radical damage and blood vessel dysfunction [R].

Benfotiamine improved circulation and blood vessel health in diabetic mice and helped muscle heal after suffering from poor blood flow [R, R].

Benfotiamine protected the hearts of diabetic mice from the damaging effects of high blood sugar. Specifically, it improved blood circulation and strengthened heartbeats while reducing cell death [R].

Benfotiamine also protected human retinal cells from high blood sugar by stabilizing cell structure and reducing cell death [R].

Benfotiamine increased the breakdown of sugar while reducing the production of NOX4 in muscle fibers. The NOX4 gene is involved in heart failure, kidney failure, and diabetic nerve damage [R].

2) Benfotiamine Protects the Brain

Benfotiamine reduced depression symptoms and improved mental function in mice by decreasing production of GSK3b. This triggers serotonin pathways that reduce anxiety and help heal damaged brain cell connections [R].

Benfotiamine reduced the impact of stress on mice, improving anxiety symptoms and reducing brain cell degeneration [R].

Benfotiamine also protected brain cells from free radical damage in mice [R].

Furthermore, in cell studies, benfotiamine reduced inflammation in brain cells, a known cause of neurodegenerative diseases. It did this by boosting brain immune defenses and anti-inflammatory signals while inhibiting inflammatory signals [R].

3) Benfotiamine Reduces the Damaging Effects of Alcohol

A dose of benfotiamine 30 minutes after consuming alcohol protected the liver from damage in mice [R].

Alcoholics are typically deficient in thiamine, which impairs their cognitive abilities and psychological well-being. Daily dosage with benfotiamine improved depressive symptoms in 85 long-term alcoholics (DB-RCT) and reduced drinking in 21 female participants (DB-RCT), indicating it may facilitate recovery [R, R].

4) Benfotiamine Protects Against the Harmful Effects of Smoking

Smoking increases inflammation and oxidative stress in blood vessels, which can eventually lead to blood vessel dysfunction. Benfotiamine reduced these harmful effects by half in 20 participants [R].

5) Benfotiamine Protects the Kidneys

Benfotiamine protected the kidneys and gut of rats during dialysis. Specifically, it reduced harmful AGEs in the blood and stabilized cell structure to reduce cell death [R, R].

In a pilot study, benfotiamine enhanced the antioxidant defenses and reduced DNA damage in 15 hemodialysis patients [R].

6) Benfotiamine May Improve the Symptoms of Alzheimer’s Disease

Benfotiamine improved the cognitive abilities of five patients with mild-to-moderate Alzheimer’s Disease [R].

In studies of brain cells, benfotiamine prevented the accumulation of plaques associated with Alzheimer’s disease by reducing the production of GSK3 [R].

7) Benfotiamine May Reduce AGEs

Advanced glycation end-products (AGEs) are the harmful attachment of sugars to fats and proteins and are involved in aging, diabetes, arthritis, cancer, brain disorders, and hardening of the arteries [R, R].

Benfotiamine reduced the levels of AGEs in 41 and 6 diabetic participants (DB-CT) [R, R].

8) Benfotiamine May Inhibit Cancer Growth

Benfotiamine inhibited the growth of leukemic tumors in cell studies by facilitating cell death and enhancing the effects of chemotherapy [R].

9) Benfotiamine May Speed Recovery from Heart Attack

By enhancing the growth of new blood vessels and decreasing the rate of cell death in mouse hearts, benfotiamine improved the rate of recovery after a heart attack [R].

10) Benfotiamine May Reduce Inflammation

Benfotiamine prevented cell death and inflammation due to bacterial toxins in mouse immune cells [R].

Synergistic Benefits of Benfotiamine and Other Treatments

1) Benfotiamine and Vitamins B6 and B12, Alpha-Lipoic Acid, and Fenofibrate Improves Diabetic Complications

A combination of benfotiamine and vitamins B6 and B12 improved nerve damage and feeling in fingertips in two studies with 24 and 36 diabetic patients (DB-RCT) [R, R].

When paired with slow-release alpha-lipoic acid, benfotiamine reduced complications in nine diabetic patients by normalizing levels of AGEs and inhibiting other harmful protein reactions [R].

Benfotiamine improved blood vessel health and kidney function in diabetic rats when combined with fenofibrate, a drug primarily used to reduce cholesterol [R].

2) Benfotiamine with Vitamins B6 and B12 Reduces Symptoms of Rheumatoid Arthritis

A combination of benfotiamine, vitamin B6, and vitamin B12 reduced inflammation and improved blood vessel function in 24 patients with rheumatoid arthritis [R].

2) Benfotiamine and Resveratrol Reduce Pain

Taken with resveratrol, a natural phenol found in the skin of grapes, benfotiamine reduced pain in mice [R].

3) Benfotiamine and Anticonvulsants Reduce Nerve Damage Symptoms

Benfotiamine with either gabapentin or carbamazepine (anticonvulsants) reduced sensitivity to touch caused by nerve damage in rats [R].

4) Benfotiamine and Erythropoietin Improve Chemotherapy Side Effects

Benfotiamine protected nerves from damage due to chemotherapy in rats when paired with erythropoietin, a hormone that stimulates the production of new red blood cells [R].

Limitations and Caveats

While the current research is promising on the benefits of benfotiamine, most double-blind, randomized controlled trials on the supplement concern diabetics with nerve damage. Additional DB-RCTs will be necessary to confirm the health benefits of benfotiamine in individuals with other diseases and conditions.


Clinical trials have found benfotiamine to be most effective in dosages of 300 to 600 mg per day, divided into two doses [R, R].

Side Effects and Adverse Effects

There have not been any side effects or adverse effects from benfotiamine alone reported in the scientific literature. However, there is anecdotal evidence of a number of side effects, including nausea, dizziness, and low blood pressure.

Drug Interactions

Research on interactions involving benfotiamine and thiamine is lacking. Benfotiamine may be useful when taking medication or supplements that lower blood levels of the vitamin B1, such as diuretics and certain heart medications [R, R].

Benfotiamine contains sulfur and is therefore not recommended for people with sulfur sensitivity.

User Experiences

“My mother is in her upper 80s and has type 2 diabetes. For a year or two, she was getting neuropathy in her feet that caused so much pain, she could hardly walk without assistance. Her doctor had her try benfotiamine, and after a few days or so, she found substantial improvement, and there were no unwanted side effects… The doctor started her on 150 mg twice a day for the first month, and now she is on 100 mg twice a day, still with good effects.”

“I have fibromyalgia and chronic myofascial pain that once was accompanied by consistent burning leg pain… Benfotiamine was the only ingested substance that curbed the burning pain all day… Several times I ran out and within 1 – 2 days my legs were on fire again, so it was quite obvious the benfotiamine made a big difference.”

“Benfotiamine worked for me. I noticed effects within a few hours of taking it. My eyes felt stronger and did not tire easily when using the computer. I take two in the morning and two at night. I also have no more tingling in my hands, and my kidney seems to have stopped aching.”

“I read a research study on the use of this product for uveitis, a serious eye inflammation and major cause of blindness. It worked in only 2 weeks, and it worked far better than the steroids. I have no more pain, no discoloration of my eye and no burning tears.”

“I’ve been taking this product for pain – sometimes kind of burning – in the bottom of my foot – the pain may be neurological, but the docs don’t know (I have no blood sugar issues). At first I thought perhaps it was working, but now I’m not so sure (after 3 bottles at 300 mg 3x/day).”

“I am finishing my 5th bottle at 3 caps per day and as a person with neuropathy in my feet for 5 years I have experienced no improvement whatsoever.”

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