Hello there, I've had this problem for a while now. Supplements going rancid.
I bought Nature's Best Ginkgo Biloba several times now. Same for LEF two per day. I live in Britain so the weather is not at all hot.
I've had problems with both these supplements going off. I had problems with Nature's Way EGB761 too. I think I started to realise because they are high quality brands, so the new bottle effect was noticeable compared to one that was starting to degrade.
When fresh the Nature's Best is even better than the Nature's way, so I'm noticing it even more.
I can tell they have gone off because:
(a) The Ginkgo tablets changed taste (less bitter) and texture (less firm so they didn't go "crunch" as much).
(b) The "whoosh" feeling and firm skin I get from Ginkgo is lessened.
© The LEF capsules changed taste from OK to pukeworthy.
(d) The LEF capsules changed colour from pale yellow to dark yellow.
Can anyone give tips to me on how to store supplements? Currently I'm keeping every different type bottle I have to experiment as I try desperately to stop these two supplements from going off. I recently had the Ginkgo start to go off after TWO WEEKS!!