Breastfeeding low milk supply.

I need help my baby is 6 weeks today and I am only producing about 2 oz of breast milk every 3-4 hours I let my baby nurse for 20-40 minutes a breast and I pump if he hasn’t nursed I have been needing to supplement with formula because he is taking anywhere from 5-6 oz every 3-4 hours I want to produce more milk but nothing seems to help I have tried lactation brownies, cookies, lemonade, supplements, nursing him longer to stimulate more milk production and power pumping. Could something be wrong with my hormones? Has anyone else had this problem and seen the light at the end of the tunnel I really want to only breastfeed and not give my baby formula anymore. Help.....