Signs and symptoms of cyanide poisoning usually occur less than 1 minute after inhalation and within a few minutes after ingestion
Several studies have looked at people taking high doses of both vitamins over long periods and found no meaningful decrease in their B12 blood levels
This is how our own researchers would approach the task
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Vitamin B12 is primarily found in animal-based foods, including beef, salmon, yogurt, and milk, though some plant-based foods, like nutritional yeast, are fortified with it