We do not include calcium or magnesium in our multivitamin and minerals supplement, primarily because they are large bulky nutrients and the dose required would simply make the tablet size impossibly large! Our ethos focuses on delivering effective doses of nutrients; we didn’t just want to throw in a small amount for the sake of it. Whilst many companies do include both calcium and magnesium in some of their products, they are mostly in poorly absorbed forms. For example, different forms of magnesium offer different amounts of elemental magnesium (the fraction that is actually magnesium). Magnesium oxide contains around 60% as elemental magnesium, but this form has very low bioavailability and the majority passes through the body unabsorbed. You will find this form in many standard multivitamin and mineral supplements as it is a cheap ingredient, and can give the appearance that a product is delivering a good amount of magnesium (depending on whether the labelling details the bulk magnesium or elemental magnesium). In contrast, the glutamate or citrate forms of magnesium are highly bioavailable, but are lower in elemental magnesium content at around 16%; at this low concentration, the volume required is therefore much higher, which is why people seeking magnesium benefits are often advised to purchase it as a single nutrient supplement. Around 668mg of magnesium glycinate would, for example, deliver 120mg magnesium (32% RI) and, unlike magnesium oxide, the majority of this would be absorbed and utilised by the body (and therefore offer health benefits). Similarly for calcium, we would need to add around 1g raw material to deliver 300mg calcium (around 37% of the RI).
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