This, and possible harmful side effects have led the research team to be cautious about recommending ginkgo to stroke victims.

BBC: Ginkgo could reduce stroke damage

She was prescribed an oral insulin medication -- a medicine that is no longer given to adolescents due to harmful side effects.

CNN: December 24, 2012 -- Updated 0455 GMT (1255 HKT)

Engineered in lab mice, this gene produced a protein (named OPG) that vastly increased bone strength and thickness-without causing any harmful side effects.

FORBES: Biotech Behemoth

It is "extremely unlikely" that anyone who has consumed affected horse meat will suffer harmful side effects, she said in a statement Thursday.

CNN: UK arrests, French investigation in horse meat scandal

The vaccine has caused tumors to regress in mice, and a trial in 14 seriously ill humans stimulated immune response without harmful side effects.

FORBES: In search of antigens

These harmful side-effects might be tolerable if compulsory savings served to boost national saving, and if this led to higher investment and faster growth.

ECONOMIST: Compelling reasons to save

The whole point of having prescriptions is so that drugs which have harmful side-effects only go to those who are ill enough that the benefits outweigh the possible side-effects.

FORBES: Google's $500 Million Pharma Ad Fine