Overview

V t m n are rg n (carbon-containing) nutr nt bt n d thr ugh th d t and essential n small m unt for n rm l m t b l r t n . V t m n n t b th t l t and rt nt n the chemical r t n. A catalyst a ub t n th t n r the r t of a reaction-by decreasing th t v t n n rg r u r d-w th ut t lf b ng rm n ntl h ng d t the nd of th chemical r t n. The b d typically mbl v t m n-d nd nt catalysts fr m a v r t f building bl k , n lud ng m n acids, ug r , phosphates, nd vitamins. E h v t m n t ll used in mult l d ff r nt catalysts nd th r f r h mult l fun t n . Like enzymes, which r l catalysts, vitamins are nt l n m ll quantities. H w v r, nz m r m d b the b d , whereas v t m n are n rm ll obtained through th f d th t we eat. Vitamins r normally nv rt d in th b d to nz m . C nz m r organic, n n- r t n molecules th t r fun t n l parts f n nz m , which r g n r ll r t n . V t m n h w th m rt n of b l n n hum n l f . One n n um n m l nd drink w t r t ddr n ' hung r nd u n h one's thirst. But w th ut b l n n one's d t, n w ll uff r fr m disease. F r example, one needs t consume l nt , such as fru t nd v g t bl , t obtain uff nt m unt of nt l vitamin C, sailors d v r d wh n they f l d t t k fr h f d on their v g . V t m n can b classified as th r w t r lubl , wh h m n th d lv easily in w t r, r f t lubl , wh h m n they are b rb d thr ugh the nt t n l tr t with the help f lipids. Unt l th 1900s, vitamins uld only b bt n d b eating f d. H w v r, th are n w mm r ll v l bl . Th r r a f w vitamins th t w bt n b th r m n th n d r tl fr m the d t: f r example, m r rg n m n the nt t n - mm nl kn wn as gut fl r - r du vitamin K nd b t n, wh l n f rm of vitamin D is synthesized n th k n w th th help f natural ultr v l t sunlight. Some v t m n n l be obtained fr m r ur r th t can b obtained n the diet. Examples n lud vitamin A, wh h n be produced from beta r t n nd n n from th amino acid tr t h n.

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