Currently, there are no adequate studies on compliance with the use of such nutritional supplements.

Phthalates are additives used in everyday plastic products to increase their flexibility, durability and transparency.

It is also used as a mordant, in fire extinguisher, as a food additive, in fireproofing, and in leather tanning.

Undeterred, Alfred moved his lab and began experimenting with additives, eventually finding one that transformed the dangerous liquid into malleable paste, easier to handle and perfect for construction sites.

Other examples include use of additives in cattle feed to increase milk production or growth rates and decrease methane production per unit beef.

It may happen that these supplements are prescribed at inappropriate times, as in the case of folic acid, for instance, which is given after the first trimester of pregnancy, whereas its essential benefits in protecting against foetal deformities require that it be given when the pregnancy is being planned.