Ensure quantity of ingredients in each tablet / capsule.
Ensure the active ingredient is released in the body.
Test for microorganisms (E. coli, Salmonella, etc.).
Test for heavy metals (arsenic, cadmium, lead, mercury, etc.).
Ensure durability of tablets during packaging and transit.
Test for breaking-point and dissolution of tablets.
Ensure correct proportion of active ingredient.
Test for rate of release of active ingredient.