BIO 111 Lecture Notes - Lecture 12: Tunxis Community College, Retinol, Provitamin

• School: Tunxis Community College
• Department: Biology
• Course: BIO 111
• Professor: Bullions

Document Summary

4 adek. fat soluble in non-polar solvents. Since excess stored in liver & fat tissues, mega doses can be toxic. (two categories plant (pro-vitamin a/beta carotene) and animal (pre-formed/retinol) . (no basis for supplementing, us typically gets enough a) Buy in the form of beta carotene (retinol is pre-formed) From iu to mcg: iu * 0. 3 = mcg. For example: 5000 iu * 0. 3 = 1500 mcg. From mcg to iu: mcg / 0. 3 = iu. From iu to mcg: iu * 0. 6 = mcg. For example: 5000 iu * 0. 6 = 3000 mcg. From mcg to iu: mcg / 0. 6 = iu. Vitamin d *synthesized from exposure to sun using cholesterol optimal intake. Supplementation if no sun exposure (<15 minutes/d), african american, < 600 iu/d (400 iu optimal), form. Vitamin d production plateaus after a short amount of time in the sun. More exposure won"t produce extra vitamin d, just skin damage.