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Description
Similar to caffeine but much milder

This can be less effective for people with gastrointestinal issues, older adults, or anyone with poor absorption
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[DOI] [PMC free article] [PubMed] [Google Scholar] 99.Ingram DK, Weindruch R, Spangler EL, Freeman JR, Walford RL

Importantly, studies interrogating the effects of drug exposure on both expression and function suggest that increased expression does not necessarily correlate with functional readouts of receptor activity

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