[kazooie]

How much of an effect does Fenugreek on its own have towards breast growth in a bio-male that has a fully male chest?

Very little if any. Like anything else, it can be affected by many other factors (your T vs. E, how much DHT your body makes, etc.), but the main action of FG is on breast tissue which has developed along stereotypically female lines.

Ok cool thanks for the answer. I'm mostly interested in Fenugreek for its anti-visceral fat qualities.