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I've got two brews bottled about 6 weeks ago that taste okay but have no fizz at all. I think the problem is that I put in level teaspoons of dextrose that I now know weighed about 2-3 grams.
If you get them really cold you can try adding a carb drop and quickly capping again. Ive read on hear somewhere that you can add dex dissolved in water, i think. Do a search.
Even 2-3 grams should produce some fizz, how does it taste? are you sure its not infected? When i say some fizz it wouldnt be much but there should be something there What temp have they been stored at??