Vitamin B1 (Thiamine) is needed for carbohydrate metabolism; deficiency may cause irritability, Depression, loss of concentration, fatigue and Insomnia. In alcoholics and the elderly, deficiency can cause Memory Loss and Heart Failure.
Whole cereals, nuts, beans, peas, pulses, yeast, pork, beef, liver, wholemeal bread
Capsules or tablets, usually found in combination with other B vitamins
Children 0.2-0.7 mg
Women 0.7-0.8 mg
Pregnant women 0.9 mg in last 3 months
Lactating mothers 1.0 mg
Maximum dose under 50 mg/day
An excess of 3 g a day may cause Headache, irritability, Insomnia, rapid pulse, weakness, contact Dermatitis, pruritis - and in one case has led to death.
Dosages advised are deliberately on the safe side and may not be high enough to give benefit, but it is recommended that higher dosages should only be taken under the care of a practitioner experienced in nutritional medicine.
Side Effects refer to effects of much larger doses on the whole than those recommended here.
* for explanation, please see Introduction to Nutritional Supplements