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For example, one study found that after taking 1,000 mcg of oral vitamin B12, only about 1.3% (13 mcg) is absorbed into the bloodstream
This is especially important for individuals with absorption issues, such as those with gut inflammation or certain dietary restrictions
Injections help the body absorb the vitamin better than through diet alone
Vitamin B complex includes B1, B2, B3, B5, B6, B9, and B12
What to look for in a supplier Third-party testing: Reputable suppliers provide certificates of analysis (CoA) from independent labs verifying purity and identity
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