The more iron absorbed, the less the amount of free iron was initially present in your pet's blood stream. (2ndchance.info)
Free iron exists in all formulas (even low - iron formulas) and pretty much in any solid food besides pure fats or refined sugars. (babyreference.com)
Once free iron is added to a breastfed child's diet, it will saturate and overwhelm the lactoferrin, feed challenging bacteria, and allow them to flourish. (babyreference.com)