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Thank you for wise advice x The GP surgery keeps them in the fridge but take them out in time for my jab because we discovered that if the ampoule was taken from the fridge and was injected immediately my arm was painful but if it was at room temperature I feel no pain

This enzymatic action depletes the available intracellular pool of nicotinamide, directly limiting the synthesis of nicotinamide adenine dinucleotide (NAD+)

However, the timeline varies from person to person

Plan this out beforehand based on your research protocol's needs

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