Info-supplemental nursing systems?

Hello ladies,

Long story short, I got a breast reduction years ago in college and with my first daughter, I had difficulty with my supply for breastfeeding. I had to supplement with formula more than 50% of time the older she got. I just heard about SNS from a post on Instagram and wanted to know if anyone has experience with them or essentially how/ if they work. Or if anyone can guide me in right direction for more info.

Hoping to increase my supply for baby girl #2. Thank you in advance!💜