It isn't illegal to chew gum, but it is illegal to bring them into Singapore or sell them except for medical purposes. Since you can't buy gum (selling is illegal) there's no way to chew them so it's almost as good as not being able to chew gum. See this: http://www.customs.gov.sg/leftNa...
Definition: In Vitro. A study done in vitro, in contrast, looks at how a drug or procedure responds in the confines of a test tube or laboratory dish. Clinical trials or medical studies may be performed either in vivo or in vitro.
What is IVF? IVF stands for the medical procedure known as in vitro fertilization. âIn vitroâ literally means âin glass.â IVF is a process whereby human life is generated in a laboratory environment such as a glass petri dish. The process of IVF begins when fertility technicians administer hormone treatments to a woman.