insoluble soap

in·sol·u·ble soap

soap made with a fatty acid and an earthy or metallic base (iron or calcium salts of fatty acids).
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5) Free palmitic acid tends to complex with minerals and form insoluble soaps with calcium ions that cannot be absorbed in the small intestine and are thus excreted in the faeces (Figure 3).
Structured lipids: matching mother's milk for a healthy start to life: mother's milk just might be the perfect food, especially for exclusively breastfed infants when it's the sole source of nutrients during the first several months of rapid growth and development
These insoluble soaps are then excreted, preventing bile salts from harming the colon.
The multi-purpose mineral: calcium plays more roles in health than building strong bones
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