Great question, this is something we’ve been researching too! We have done 3rd party testing on pouches after their best before date, and Ambronite may be edible some time after this, but some micronutrients like vitamin C will take a hit.
The best before date is there to make sure the taste and nutrients are in great shape.
I’ve personally had dozens of meals after their best before date, and while the taste has gained some more almond bitterness, they’ve been OK and have worked well.
The method of storage has an impact - cool and away from light helps. Heat makes the foods and fats within degrade faster, so no sunlight or leaving in the car. I’ve left some Ambronites in a hot car, and didn’t notice a difference afterwards, but heat + time is detrimental to ingredient freshness and probably taste, too.
Microbiologically and hunger-satisfying-power -wise, your Ambronite may be fine still after the best before on the pouch, pending on how it’s been stored. Not optimal/recommended, as the taste and nutrients may take a hit, but I’ve personally enjoyed these without issue. The taste may gain bitterness, but eg. a apple or cranberry juice or avocado blend hides this pretty much completely. Your own taste buds are the best judge here.