Vitamin B12 contributes to normal nervous-system and psychological function, supports the immune system, helps maintain normal homocysteine metabolism and reduces tiredness and fatigue. Children aged 3–12 take one tablet daily; adults and children over 12 take one tablet daily (may be increased to two) and allow it to dissolve under the tongue. Tablets are sweetened with tooth-friendly xylitol and are free from yeast, gluten, wheat, soya, dairy, lactose, sugar, gelatine, salt and artificial colours or preservatives.