Chambers 20th Century Dictionary(0.00 / 0 votes)Rate this definition: 1  Rock. rok, n. a large mass of stone: (geol.) a natural deposit of sand, earth, or clay: that which has the firmness of a rock, foundation, support, defence: (Scot.) a distaff: a hard sweetmeat.âv.t. to throw stones at.âns.
Since B-vitamins can be somewhat activating, it is best to take a multivitamin in the morning or afternoon. Minerals such as calcium and magnesium that serve as natural muscle relaxants can be taken in the evening to ensure a good nightâs sleep.
Vitamin D is responsible for proper absorption of calcium, so you need lots of this vitamin every day for optimal bone strength. Vitamin D-3 is the form found in many supplements and most foods that are rich in vitamin D, and it's the kind your body makes when you get sun exposure. Although D-3 is beneficial, too much can lead to toxic effects.