Letrozole has been used for ovarian stimulation by fertility doctors since 2001 because it has fewer side-effects than clomiphene ( Clomid ) and less chance of multiple gestation. A study of 150 babies following treatment with letrozole or letrozole and gonadotropins presented at the American Society of Reproductive Medicine 2005 Conference found no difference in overall abnormalities but did find a significantly higher rate of locomotor and cardiac abnormalities among the group having taken letrozole compared to natural conception.  A larger, follow-up study with 911 babies compared those born following treatment with letrozole to those born following treatment with clomiphene.  That study also found no significant difference in the rate of overall abnormalities, but found that congenital cardiac anomalies was significantly higher in the clomiphene group compared to the letrozole group. Despite this, India banned the usage of letrozole in 2011, citing potential risks to infants.  In 2012, an Indian parliamentary committee said that the drug controller office colluded with letrozole's makers to approve the drug for infertility in India and also stated that letrozole's use for infertility was illegal worldwide;  however, such off-label uses are legal in many countries such as the US and UK.  
Anabolic steroids are synthetic derivatives of testosterone . Certain clinical effects and adverse reactions demonstrate the androgenic properties of this class of drugs. Complete dissociation of anabolic and androgenic effects has not been achieved. The actions of anabolic steroids are therefore similar to those of male sex hormones with the possibility of causing serious disturbances of growth and sexual development if given to young children. Anabolic steroids suppress the gonadotropic functions of the pituitary and may exert a direct effect upon the testes .
Lactones contribute significantly to the flavor of fruit, and of unfermented and fermented dairy products,  and are therefore used as flavors and fragrances.  Some examples are γ-decalactone (4-decanolide), which has a characteristic peach flavor;  δ-decalactone (5-decanolide), which has a creamy coconut/peach flavour; γ-dodecalactone (4-dodecanolide), which also has a coconut/fruity flavor,  a description which also fits γ-octalactone (4-octanolide),  although it also has a herbaceous character;  γ-nonalactone , which has an intense coconut flavor of this series, despite not occurring in coconut,  and γ-undecalactone .