Breastfeeding parents have historically used fenugreek to increase milk supply. However, the evidence is mostly anecdotal (based on things people have said they’ve experienced, rather than being scientifically proven).
Research on its usefulness, safety and side effects varies widely and studies are generally small.3,4,5 It’s not recommended by the NHS, and The Breastfeeding Network reports the potential for serious side effects (though how common they are is unknown) and says it shouldn't be used during pregnancy.6
While fenugreek is "generally recognised safe” as a flavouring, there’s not enough evidence to say whether it’s definitely safe for everyone in larger quantities.7 Anyone wanting to take fenugreek supplements for breast milk should speak to their GP or health visitor to weigh up the potential benefits and risks.