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 should not be taken before bed. Vitamin D is a hormone that your body makes while being exposed to sunlight. This process leads to melatonin shutdown in the pineal gland, because sunlight only occurs DURING THE DAY. The best way to take Vitamin D is a liquid micellized D3 in the morning with dietary fat.