Our expert says:
Congratulations on your pregnancy. Vitamin and mineral supplements are NOT supposed to be left to dissolve in water for long periods as this will reduce their vitamin content (for example, vitamin C when dissolved in water is broken down by oxygen). We do not have the Ethex brand of prenatal supplements in South Africa, but I suspect that it is the iron in the supplement that produces the black colour. When one takes iron supplements the stools are also often dark coloured. Pregnant women are often deficient in iron which is why this is one nutrient that is usually prescribed for pregnancy. I would suggest that you discuss this supplement with your pharmacist or the dr who prescribed it for you if you want a different kind of prenatal supplement as the names of the South African products will differ from the ones that are available in the USA.
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