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Caffeine sensitivity is highly individual it depends on genes (CYP1A2, COMT), which determine the speed of its metabolism and the nervous systems response
Balasubramanian, S
It is non-addictive and does not cause withdrawal (some people worry they cant sleep without it, but thats usually because their underlying insomnia returns, not because of dependency)
How a laboratory further stores and handles the material in this pen format falls entirely within that laboratory's own validation and storage protocol
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