contraindications b12 injections Shots: Vitamin B12 Benefits, Uses, Risks Compounded Vitamin B-Complex Injection |
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It doesn't make any difference

For example, a protocol requiring 100 mcg doses is easier to measure with a higher concentration (less volume per dose)
Individual injection costs may typically range from $35 to $75 per shot [7] , while some providers may offer packages that may reduce the per-injection cost

If anyone in your blood family has an autoimmune condition it's more likely (but not definite) that you could develop one also (this includes the Hashimtos thyroiditis that Marz has previously mentioned)
