Vitamin B1

Vitamin B1 (Thiamine) is a water-soluble micronutrient essential for the metabolism of carbohydrates and branched-chain amino acids. Discovered in the late 19th century by Christiaan Eijkman and later isolated by Casimir Funk, it was the first of the B-complex vitamins to be identified. Because the human body cannot synthesize thiamine and stores only small amounts in the liver, a continuous dietary supply is necessary to maintain metabolic baseline efficiency, support mitochondrial integrity, and sustain normal neurological health.

Clinical Benefits & Mechanism of Action

Thiamine functions primarily through its active phosphorylated form, thiamine pyrophosphate (TPP), also known as thiamine diphosphate. It acts as a critical coenzyme for several multi-enzyme complexes within the mitochondria:

1.  Pyruvate Dehydrogenase (PDH) Complex: TPP is required to assist the conversion of pyruvate into Acetyl-CoA. This step links glycolysis to the Citric Acid Cycle (Krebs Cycle), making it a key coordinator of aerobic energy production.
2.  Alpha-Ketoglutarate Dehydrogenase ($\alpha$-KGDH): This enzyme represents a primary regulatory step in the Citric Acid Cycle. Thiamine optimization supports steady ATP production and helps manage regular glutamate levels, thereby supporting healthy neurological balance.
3.  Transketolase: As a key enzyme in the Pentose Phosphate Pathway, TPP facilitates the natural production of NADPH (required for cellular antioxidant defense) and ribose-5-phosphate (required for DNA and RNA synthesis).
4.  Neurotransmitter Modulation: Thiamine is involved in the regular synthesis of Acetylcholine and GABA. It also plays a non-cofactor role in supporting the natural initiation of nerve impulses along the axon membrane by modulating sodium channels.
5.  Myelin Maintenance: It supports the baseline integrity of the myelin sheath, the protective coating of neurons, which ensures normal, rapid signal transduction throughout the peripheral and central nervous systems.

Scientific Sources & Clinical Trials

• Thiamine and the Brain.
• Efficacy of thiamine (vitamin B1) in sepsis and septic shock: A meta-analysis of randomized controlled trials.
• The role of thiamine deficiency in alcoholic brain disease.
• Thiamine Supplementation and Lactic Acidosis in Patients with Sepsis.