I wrote the other day about Vitamins for Pre/Pregnancy/Post stages and how it compared to a competitor Materna. Janine had a great comment on how your body can only process so much vitamins and the rest are just disposed of. I’ve also heard this as well and so I did some digging and also checked with a few friends who are in the medical profession to get some better understanding.
First and foremost always take the prescribed dosages that are on any supplements or vitamins you take. If you start taking multiple vitamins and supplements always check with a physician or whoever you take your nutrition advise from.
What I did find out is there are maximum’s for every vitamin and supplement for your body. It’s varies depending on age, gender and if your pregnant and also for what type of vitamin. I won’t go into all the maximum’s because well it’s just a TON of information.
Some important things to take note of though is that there are two types of vitamins. Water Soluble Vitamins and Fat Soluble Vitamins. Water Soluble vitamins are all the B-Vitamins as well as Vitamin C. So these are not stored in your body. If you take to many or more than what your body can handle then yes it will just excrete them out. You’d just be wasting your money.
Vitamin A, D, E, and K are Fat Soluble Vitamins, if you take excess doses then your body will store them in your fat and liver. The problem with them being stored is they can become toxic. So make sure you take the recommended daily intake, that being said your body can take a bit more on then what is recommended because recommended is always lower for safe guards. Again check with your Doctor.
With all Vitamins and Supplements if you check on what the Tolerable Upper Intake Level (UL) is for each vitamin then you’ll know what your body can handle at the highest level that will likely pose no risk.
Here is a great PDF document from Health Canada that shows the Dietary Reference Intakes. You can find your RDA (Recommended Dietary Allowance), AI (Adequate Intake) and UL.
http://www.hc-sc.gc.ca/fn-an/alt_formats/hpfb-dgpsa/pdf/nutrition/dri_tables-eng.pdf
You can find out a lot of information here about the Dietary Reference Intakes if your curious.
http://www.hc-sc.gc.ca/fn-an/nutrition/reference/index-eng.php
So while some vitamins will just pass through you if you take to much it’s important to know that some vitamins like the fat soluble vitamins will actually stick around and can do more harm than good.
Hope that helps clear things up!