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A healthcare provider uses a small needle to deliver the dose intramuscularly, allowing the nutrient to absorb through the muscles blood supply

Without robust blood flow, the disc's ability to repair itself is profoundly limited

Vitamin B12 injections bypass the digestive tract and deliver cobalamin directly into muscle or fatty tissue, which is why healthcare providers often recommend them for people with pernicious anemia, malabsorption conditions, gastric bypass history, strict plant-based diets, or age-related B12 decline

One study found that the sublingual form (which dissolves under the tongue) was more effective than an oral (swallowed) form