* soybeans are high in phytic acid, which, in large amounts, can block the uptake of essential minerals like calcium, magnesium, copper, iron and especially zinc in the intestinal tract.
* effects overdosing on [[isoflavones]] is still unknown. See page '[[Isoflavones]]' about possible risks of overdosing isoflavones. People who are trying to fall pregnant, those who have difficulty urinating under normal circumstances, breastfeeding moms, those with kidney problems and prostate cancer and anyone suffering from peanut allergies should avoid this ingredient.
I believe it's probably safer, until more is learned, to avoid concentrated soy supplements entirely.
* contains enzyme inhibitors, which hinder protein digestion and haemagluttin, which causes red blood cells to clump together and inhibits oxygen take-up and growth.
* Research has shown that babies who have been fed soy-based formulas were at higher risk for developing type-1 diabetes and thyroid disease later in life. Soy-based formulas also contain up to 1000 times more aluminium than non soy-based formulas.