Using plain sterile water for multi-dose vials: Sterile water has no preservative
Some researchers have conceptually explored combining both strategies for potentially synergistic effects on intracellular NAD+ levels, though no published data exists for this specific combination
On my farm, we keep a multi-species B12 solution on hand that can be administered to any species of livestock we have on the farm (we raise sheep, chickens, and pigs, but the solution could also be used for goats and cattle or even domesticated pets)
Outer thigh and back of upper arm are alternative sites
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Recommended daily intake for adults in the UK is 1.5 micrograms, easily achieved through a balanced diet including meat, fish, dairy products, and fortified foods