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Cloney, K., Ramsey, S., & Burns, E

The honest boundary is that even the coherent pairing is a mechanistic hypothesis with no human validation, so the most defensible research posture is to study the single compound at its documented dose first, and treat any combination as a further, clearly-labelled research question rather than a default

On that test, an NNMT inhibitor plus an NAD+ precursor is at least internally coherent one addresses the drain, the other the supply while pairing 5-Amino-1MQ with an unrelated appetite-acting compound is not synergy, it is simply two separate interventions being run at once

Each category works through a different mechanism, carries a different level of clinical evidence, and comes with its own cost and safety considerations, so understanding the distinction matters before choosing one