Just a reminder: Diet and lifestyle matter because chronic inflammation constantly drains

Well SupportedNicotinamide riboside (NR) can cross cell membranes directly, while NMN cannot due to its phosphate group, making NR a more effective oral NAD precursor.

Well SupportedAs individuals age, they lose the ability to produce NAD and consume it more rapidly, with the immune system and DNA repair being significant drains.

Well SupportedA clinical trial indicates that nicotinamide riboside (NR) has long-term beneficial effects in humans.

Not SupportedOral NMN is unlikely to be absorbed intact because it has a charged phosphate group and is subject to hydrolysis by non-specific phosphatases in the small intestine.