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[19] An 8 fl oz (240 mL) cup of coffee has 80-100mg of caffeine
Never substitute one for the other without first confirming compound compatibility and protocol requirements
For someone with documented deficiency, on long-term metformin or a PPI, or with confirmed absorption problems, step up to a higher-potency option like Jarrow Methyl B-12 5,000 mcg under a clinician's guidance
They serve different purposes and stack well together in regenerative protocols
Reputable suppliers publish third-party certificates of analysis confirming purity, commonly 99%
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