In some embodiments, the formulation or composition has a retention time in the ear of at least 5 minutes, at least 15 minutes, at least 30 minutes, at least 1 hour, at least 4 hours, at least 6 hours, at least 12 hours, at least 18 hours, at least 1 day, at least 2 days, at least 3 days, at least 4 days, at least 5 days, at least 6 days, at least 7 days, at least 10 days, at least 12 days, at least 14 days, at leastl8 days, at least 21 days, at least 25 days, at least 30 days, at least 45 days, at least 2 months, at least 3 months, at least 4 months, at least 5 months, at least 6 months, at least 9 months or at least 1 year
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People who follow vegetarian or vegan diets might not get enough B-12 through food alone and are at a higher risk of developing deficiency over time
Zhou et al., 2011)