The Human Fertilization and Embryology Authority is a government run organization that ensures clinics in the UK comply with the law. They also have a “traffic light” system for evaluating the effectiveness of different IVF add-ons.
RED means there’s no evidence that a treatment is effective or safe.
AMBER means there’s little evidence so more studies are needed.
GREEN means it works!
Synonyms:
HFEA, traffic light