If improved health and vitality is what you're after, you should also aim to get plenty of B12 through your food, incorporating health-promoting fortified foods like nutritional yeast, natural fortified cereal, and fortified plant milks into your diet (and maybe a few vegan gummy vitamins on top to help with specific issues)
Consult a specialist, get labs, and select a safe, tested product
Standard dosing protocols derived from animal research and community consensus suggest 0.25-0.5 mg daily as the therapeutic range for most applications
[] When the impact of NAC on biochemical indicators of inflammatory processes was further examined, blood levels of C-reactive protein (CRP), tumour necrosis factor-alpha, IL-10, IL-6, IL-8 and brain-derived neurotrophic factor (BDNF) showed no significant changes