Natures Aid Vitamin B Complex 100 Mega Potency provides vitamin C alongside a 100mg B vitamin complex. B Vitamins contribute to The reduction of tiredness and fatigue, the normal functioning of the nervous system. Normal energy-yielding metabolism and normal psychological function. B Vitamins are water-soluble and have a natural bright yellow colour. Occasionally this can cause your urine to become naturally bright yellow. Available in 30 tablets bottle.