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By delivering the B12 directly into your muscle, the vitamin bypasses the digestive system entirely, allowing for complete and immediate absorption

Because B12 injections deliver B12 straight into your muscle and bloodstream, they skip the slow digestive route that oral pills rely on, so you notice the difference far sooner than you'd expect

For other forms, see Methylcobalamin and Adenosylcobalamin

The Bottom Line Vitamin B12 can lift energy and mood, especially if you have a deficiency

Use a 0.5 to 1.0 millimeter needle length for scalp applications

However, there are no well-controlled studies in pregnant women, so this medication is generally recommended during pregnancy only when clearly needed