For individuals, following a plant-based diet, fortified plant-based milk, and nutritional yeast can help bridge the gap
The company makes its Certificate of Analysis available on the product page, which screens for contaminants including heavy metals, microbial pathogens, and residual solvents
For them, the cyanide can accumulate and this form of B12 can make things worse
TB-500 safety data is less extensive but similarly suggests good tolerability in preclinical models
2009 Dec;60 Suppl 7:191-6
This viral persistence is thought to drive ongoing immune activation, prompting the immune system to continuously mount responses against the viral antigens it keeps detecting