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Topical and nasal routes are included because readers encounter them in the market

The liver stores 50 to 90% of the bodys total B12 reserves

Oral supplements work for many people, and injections are another reliable option, especially for those who are already symptomatic and confirmed low

Many wellness centers, med spas, and functional medicine clinics offer B12 injections as part of a broader wellness package

Poor website/communication: If their website looks sketchy, emails go unanswered, or information is vague, look elsewhere

The effects of a B12 shot usually last one to two weeks, but the vitamin itself can stay in your system longer