Generally speaking, the vertical axis of a tropical cyclone, usually defined by the location of minimum wind or minimum pressure. The cyclone center position can vary with altitude. In advisory products, refers to the center position at the surface.
Two prescription medicationsâVectical and Dovonex, which are applied to the skinâinclude vitamin D as their main active ingredient. Edee Scott, 72, of Corona, Calif., says vitamin D medication has helped calm her psoriasis, which is most severe on the palms of her hands and feet. She's had psoriasis since age 14, but it's only in the past 15 years that her psoriasis has taken on a life of its own, she says.
Water-soluble vitamins. Water-soluble vitamins travel freely through the body, and excess amounts usually are excreted by the kidneys. The body needs water-soluble vitamins in frequent, small doses. These vitamins are not as likely as fat-soluble vitamins to reach toxic levels. But niacin, vitamin B6, folate, choline, and vitamin C have upper consumption limits. Vitamin B6 at high levels over a long period of time has been shown to cause irreversible nerve damage. A balanced diet usually provides enough of these vitamins. People older than 50 and some vegetarians may need to use supplements to get enough B12.