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Factors Influencing Dosage and Frequency Several factors can influence the dosage and frequency of Vitamin B12 injections: Severity of Deficiency: More severe deficiencies require higher doses and more frequent injections initially

Without a preservative, every needle entry introduces contamination risk

Vitamin B12 injections are administered subcutaneously (under the skin), and can be given up to twice weekly

Frequently Asked Questions About Sciatica and Vitamin B12 Does vitamin B12 help sciatica

The same could be said for Quicksilver Scientific if you feel the easier route of administration and higher overall serving volume are worth a little more up front