Nootropic profile
Vitamin B1 (Thiamine)
Vitamin B1 (thiamine) is an essential B vitamin that plays a critical role in brain energy metabolism by converting glucose into ATP. Low thiamine levels are closely linked to cognitive impairment, poor concentration, and neurological damage, making adequate intake vital for healthy brain function.
Best for
Educational only: this is not medical advice. Always check with a qualified healthcare professional before starting any supplement.
What is Vitamin B1 (Thiamine)?
Thiamine (vitamin B1) was the first B vitamin to be discovered, earning it the designation "B1." It is a water-soluble vitamin that serves as a cofactor for several key enzymes involved in carbohydrate metabolism and energy production.
What it does for you
Community and editorial ratings, out of 5:
How to take it
- RDA: 1.1-1.2 mg per day for adults
- Nootropic dose: 50-100 mg per day (well above RDA, but thiamine has excellent safety at high doses)
- Benfotiamine: 150-300 mg per day - a fat-soluble form with better bioavailability, particularly for neuroprotective effects
- Sulbutiamine: A synthetic thiamine derivative that crosses the blood-brain barrier more readily (covered in its own profile)
- Timing: Take with food. Morning dosing preferred as B vitamins may affect energy levels.
Watch out for
- Side effects: Extremely safe with virtually no reported toxicity from oral supplementation, even at very high doses. Rare allergic reactions possible.
- No upper limit: No Tolerable Upper Intake Level (UL) has been established because of thiamine's excellent safety profile.
- Drug interactions: Loop diuretics (furosemide) can increase thiamine excretion. Fluorouracil (chemotherapy) may reduce thiamine activity.
- Alcohol: Chronic alcohol use dramatically depletes thiamine. Those with alcohol use disorders should supplement under medical supervision.
- Pregnancy: Safe and important during pregnancy. Thiamine requirements increase slightly during pregnancy and breastfeeding.
The science, if you're curious.
- Thiamine pyrophosphate (TPP) is an essential cofactor for pyruvate dehydrogenase, the enzyme that converts pyruvate to acetyl-CoA, linking glycolysis to the...
- TPP is also required for this citric acid cycle enzyme, further supporting mitochondrial energy production in neurons.
- Thiamine is a cofactor for transketolase in the pentose phosphate pathway, which generates NADPH (for antioxidant defence) and ribose-5-phosphate (for...
- By supporting acetyl-CoA production, thiamine indirectly supports the synthesis of acetylcholine, the key neurotransmitter for memory and learning.
Where to find it
- Pork: One of the richest food sources of thiamine
- Whole grains: Brown rice, oats, and whole wheat (refined grains lose most thiamine during processing)
- Legumes: Lentils, black beans, and peas are good plant sources
- Nutritional yeast: An excellent source for vegetarians and vegans
- Fortified foods: Many breads, cereals, and flours are fortified with thiamine
- Supplements: Available as thiamine HCl, thiamine mononitrate, benfotiamine (fat-soluble), and as part of B-complex formulas
Frequently asked
Vitamin B1 (thiamine) is an essential B vitamin that plays a critical role in brain energy metabolism by converting glucose into ATP. Low thiamine levels are closely linked to cognitive impairment, poor concentration, and neurological damage, making adequate intake vital for healthy brain function.
The main benefits people report from Vitamin B1 (Thiamine) are: Cognitive Enhancement, Energy, Focus, Longevity, Memory, Mood.
RDA: 1.1-1.2 mg per day for adultsNootropic dose: 50-100 mg per day (well above RDA, but thiamine has excellent safety at high doses)Benfotiamine: 150-300 mg per day - a fat-soluble form with better bioavailability, particularly for neuroprotective effectsSulbutiamine: A synthetic thiamine derivativ...
Side effects: Extremely safe with virtually no reported toxicity from oral supplementation, even at very high doses. Rare allergic reactions possible.No upper limit: No Tolerable Upper Intake Level (UL) has been established because of thiamine's excellent safety profile.Drug interactions: Loop...
Thiamine pyrophosphate (TPP) is an essential cofactor for pyruvate dehydrogenase, the enzyme that converts pyruvate to acetyl-CoA, linking glycolysis to the...TPP is also required for this citric acid cycle enzyme, further supporting mitochondrial energy production in neurons.Thiamine is a cofactor...
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