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.
The best way to know if you need to take a vitamin D supplement is to get your vitamin D tested, BUT only using the correct test. The test you want is the 25(OH)D test, NOT the 1,25(OH)D test. If your vitamin D levels are OK, then you should NOT take vitamin D supplements.