Tab. IX.

Sources and neurological implications of vitamins B1, B6 and B12.

Vitamin	Sources	Coenzyme for	Deficiency symptoms	Implications in nervous system	Reference
B1 (thiamine)	Fish, beans, lentils, cereals, yogurt, sunflower seeds, cereals	Pyruvate dehydrogenase, alpha-ketoglutarate dehydrogenase, transketolase	Beriberi, polyneuritis	Energy supply to nerve cells for synthesis of nucleic acids, neurotransmitters, and myelin	[95, 96, 97]
B6 (pyridoxine)	Salmon, tuna, beef liver, chicken, leafy greens, orange, banana, papaya, cantaloupe	Cystathionine-beta-synthase/lyase, serine-hydroxymethyl transferase, aromatic L-amino acid decarboxylase	Cognitive impairment, depression, premature aging of neurons	Metabolism of DNA/RNA, amino acids and neurotransmitters	[98]
B12 (cobalamin)	Dairy products, fish, poultry, eggs, meat	Methionine synthase, methylmalonyl CoA mutase	Cognitive impairment, impaired neurotransmitter production, polyneuritis, subacute combined spinal cord sclerosis	Metabolism of nucleic acids, fatty acids, amino acids, neurotransmitters, myelin	[99]