Vitamins/mineral supplements (such as Riconia Silver) are to be taken only, repeat only, when there is proven deficiency. Apart from loss of money, over-vitaminosis can lead to unfavourable consequences. It is better to consume healthy food (lots of fruits, green vegetables etc) rather than gulp artificial chemicals. The perception that such supplements are harmless is wrong. If you require calcium supplements, it is preferable to take the one derived from natural sources such as oyster shells (Logical-250 or Logical-500) rather than a synthetic preparation.