There are a lot of claims made by vitamin and mineral supplement companies that state their source material for certain vitamins and minerals are a better quality and come from a "purer source", whilst making claims that other companies state that their competitor's source materials could come from highly questionable and dubious places.
Other claims state that their source materials are 100% organic and have not been adulterated by pesticides, antibiotics, etc.
The claims and assortments of choices out there are mind boggling.
The only thing I really look out for is the natural source Vitamin E (d alpha tocopheryls versus dl alpha tocopheryls).
As for others, such as calcium from calcium citrate or carbonate, well, the choice is yours, really.
Absorption rates, high potency, seniors, active lifestyles, womens formulation, all really don't register too much with me.
If you find an improvement with what you're taking then continue, if not change to another brand. The most you'll be put out is the cost of a bottle of vitamins
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