The phrase "ancillary benefits" refers to the additional advantages or extra perks that come along with something. It means you receive extra benefits or advantages that are not the main focus but are still valuable. Full definition
And, they offer ancillary benefits like green space for weary urban minds. (scientificamerican.com)
Finally, within capitalism, you've not considered wage or ancillary benefits as transfers to labour. (politics.stackexchange.com)
Their initial results were all astounding, with many positive signs of increased metabolic rate with several ancillary benefits noticed as well, such as better vision and enhanced exercise performance. (180degreehealth.com)