by sylviak » Sun Jul 19, 2009 6:52 am
There are conflicting advices about when the best time of day is to take them: some say morning with breakfast, others say before bed. Vitamins should be treated like any other form of supplement or medication, and be taken by the instructions on the pot.
With vitamins and most nutritional supplements, the time of day isn’t so important, said Dr. Sheldon S. Hendler, co-editor of The Physicians’ Desk Reference for Nutritional Supplements. (*http://www.nytimes.com/2009/05/05/health/nutrition/05qna.html?_r=1&ref=health)
Available information indicates that administration of the total dose in several divided portions has no effect on the excretion of riboflavin, ascorbic acid or niacinamide. This would indicate that absorption of these vitamins takes place by passive transport. Divided doses of thiamine and vitamin B12 are absorbed to a significantly greater extent than single doses of these vitamins.
( *http://www.ajcn.org/cgi/content/abstract/12/3/162)
While there is not any recommended time of day, the best rule of thumb is dependent upon whether there are any side effects associated with the vitamins being taken. Scientific studies have shown that if vitamins are missed on odd days here and there, they will not actually work to their full potential. It is important to take them properly because if not then they can actually just be flushed straight through the body, and not be absorbed.
Aside from the timing issue, most vitamins and minerals should be taken with food. Although there are a few exceptions to this.
Water- soluble vitamins are supplements that do not store in the body and are therefore taken more often than fat-soluble vitamins. They include vitamins such as B1, B2, B6, B12, C and Folic Acid. Vitamin C and Vitamin B are water soluble vitamins and need to be taken daily as they will not be stored in the body for more then a day.
Fat soluble vitamins do not need to necessarily be taken every day and store themselves in the body, specifically in the liver. Fat soluble vitamins include A, D, E, K, and Beta Carotene. Because of this, a person needs to not take them in mega-doses.
Although the water-soluble vitamins B and C can be absorbed when taken with food or on an empty stomach, the fat-soluble vitamins A, D, E and K are most efficiently absorbed when taken with some foods containing fat(Vit A, D, E, fish oil, CoQ10).. Beta carotene, a member of the carotenoid family and a precursor of vitamin A, is also best absorbed with some fat. This is also the case with other carotenoids used as nutritional supplements, including lycopene, lutein, zeaxanthin, astaxanthin and fucoxanthin.
Minerals should also generally be taken with food. “Absorption efficiency of calcium carbonate on an empty stomach is poor and increases significantly when taken with food,â€Â