This isn’t an easy topic to write about nor is it an easy topic to find information about since it’s quite complex. However, we will share with you as much information as possibly can about this subject so that you no longer have any questions left un-answered by the end of this article.
Manual Msd
Esta forma ocorre em plantas e é consumida na dieta. É mais bem absorvida quando é consumida juntamente com gordura. A filoquinona não é tóxica, mesmo em grandes quantidade.
Msd Manual
Phylloquinone) is not toxic when consumed orally, even in large amounts. However, menadione (a synthetic, water-soluble vitamin K precursor) can cause toxicity (infants have developed hemolytic anemia, hyperbilirubinemia, jaundice, and kernicterus) and should not be used to treat vitamin K deficiency. Dietary fat enhances its absorption.
Infant formulas contain supplemental vitamin K. After the neonatal period, bacteria in the gastrointestinal tract synthesize vitamin K, which is absorbed and used by the body. Vitamin K2 refers to a group of compounds (menaquinones) synthesized by bacteria in the intestinal tract; the amount synthesized does not satisfy the vitamin K requirement. The actions of vitamin K–dependent proteins require calcium.
The vitamin K–dependent proteins, osteocalcin and matrix gamma-carboxy-glutamyl (Gla) protein, may have important roles in bone and other tissues. Forms of vitamin K are common therapy for osteoporosis in Japan and other countrie.
Fat-Soluble Vs. Water-Soluble Vitamins
Water-soluble vitamins Water-soluble vitamins are readily excreted from the body and not easily stored in tissues.
Water-soluble vitamins include vitamin C, plus eight B vitamins: Vitamin B1 (thiamine)
Vitamin B2 (riboflavin)
Vitamin B3 (niacin)
Vitamin B5 (pantothenic acid)
Vitamin B6 (pyridoxine)
Vitamin B7 (biotin)
Vitamin B9 (folate)
Vitamin B12 (cobalamin) Because water-soluble vitamins aren’t stored but rather excreted through urine, they’re less likely to cause issues even when taken in high doses. However, taking megadoses of some water-soluble vitamins can lead to potentially dangerous side effects. For example, taking very high doses of vitamin B6 can lead to potentially irreversible nerve damage over time, while taking large amounts of niacin — typically in excess of 2 grams per day — can cause liver damage There are four fat-soluble vitamins: Vitamin A
Vitamin D
Vitamin E
Vitamin K Given that fat-soluble vitamins can accumulate in the body, these nutrients are more likely to lead to toxicity than water-soluble vitamins.
Good Sources Of Vitamin K
Vitamin K is found in: green leafy vegetables – such as broccoli and spinach
vegetable oils
cereal grains Small amounts can also be found in meat and dairy foods.