Possible side effects include mild irritation at the injection site, headaches, nausea, and others, depending on the specific peptide
Taking B12 too close to bedtime can be stimulating for some people and may make it harder to fall asleep or stay asleep. If you notice any change in your sleep after starting B12, simply move your dose earlier in the day and track how you feel
Nobody has published that data
Factors such as your metabolism, overall health, and individual response to B12 can influence the timeline for experiencing improvements
Immunization with a heat-killed preparation of the environmental bacterium Mycobacterium vaccae promotes stress resilience in mice (in Eng)
That combination is reliable for most people, though individual circumstances will always matter