(I have coeliac disease and small intestinal bacteria overgrowth. It is easier to tell you what I can eat as I react to all weird and wonderful things.)
I recommend when changing brands to ‘go slow’.
So, injecting half a dose, to ensure there is no reaction.
That is quite possibly an issue. I have tried several brands and forms. Some give me more quick energy, some last longer. I do better with less additives so I buy Ankerman cyano from Amazon.de. I tried Hevert hydroxo. but didn't feel as well on it as the cyano. At first , the Ankerman brand seemed less effective than my Dr prescribed cyano but after a several injections I can't feel a difference between the two. It could just take time to adjust to a different formula. I have never tried the Pascoe or Panpharma, although I may at some point. I do hope you feel better soon.🌻
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