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A 2016 study found that B12 supplements that are mixed with saliva are broken down and absorbed better than supplements that are swallowed whole like capsules or soft gels
October 2003, 66 (8): 14991503
If it's cloudy or has particles, that's a red flag for potential issues
The effects of a single B12 injection typically last one to two weeks, though this varies depending on your baseline levels, metabolism, and overall health
Certificates of Analysis are published on the product page as each batch is verified this one is still being processed
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