Could you link what supplements you have purchased over the years for GLA?
Thanks
Swanson EFAs Black Currant Seed Oil
https://www.swansonvitamins.com/p/swanson-efas-black-currant-seed-oil-gla-omegatru-180-sgels
NOW Foods Supplements, Black Currant Oil 500 mg with 70mg of GLA (Gamma-Linolenic Acid), 100 Softgels
https://www.amazon.com/gp/aw/d/B000O2TNKW
NOW Foods Supplements, Borage Oil 1000 mg with 240mg of GLA (Gamma Linolenic Acid), 120 Softgels
https://www.amazon.com/gp/aw/d/B0013OQIX0
The NOW borage oil and Swanson black currant oil are both top rated in the latest ConsumerLab.com review.
I went into my purchase histories at both companies. Swanson can have the best price, but you need to get their near daily sale emails and link to their website through that promo email to get it.
You can often save a lot and time and again Swanson and NOW Foods are independently shown to have great quality.