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How long does b12 shot take effect

A 43-year-old member asked:
Dr. Michael Dugan
Specializes in Hematology
Several weeks: To several months depending on the degree of the deficit.

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A 23-year-old member asked:
Dr. Mila McManus
Family Medicine 21 years experience
It can be OK: Medications aren't guaranteed to keep their potency beyond the expiration date. It's not dangerous, but simply may not be as effective.
Dr. Richard Bensinger
Ophthalmology 52 years experience
Not bad: Most expiration dates are to satisfy legal and other criteria. The medication may gradually lose potency over many years but you are safe to take som... Read More
A 30-year-old member asked:
Dr. Foead Geula
A Verified Doctoranswered
A US doctor answeredLearn more
no: Sciatica is caused by nerve impingement in the vertebral column. Most cases resolve with conservative therapy, including physical therapy and and ant... Read More
Dr. Qamar Khan
Pain Management 17 years experience
Pinched Nerve: Sounds like you have a pinched nerve in your back. I would suggest seeing a pain/spine specialist to evaluate you further to evaluate what level and ... Read More
A 31-year-old member asked:
Dr. Yash Khanna
Family Medicine 57 years experience
Within few minutes: It start working as soon as it reaches blood sream, that takes few minutes.
A 46-year-old member asked:
Dr. Glen Farkas
Specializes in Holistic Medicine
B-12: My question is why are you taking B-12 injections? Are you anemic? If , not basic B-complex would be recommend. If, you are anemic , I would recommend... Read More
A 49-year-old male asked:
Dr. Frances Dyro
Neurology 54 years experience
The : The usual reason for getting B12 shots is that your B12 level is low either because you don't eat meat or you can't absorb vitamin b12. This is someth... Read More
A 29-year-old male asked:
Dr. Chirag Patel
Specializes in Neurology
Recheck B12 level: Before increasing your dose of vitamin B12 supplementation, you should have your vitmain B12 level rechecked to make sure that it has not yet normaliz... Read More
A 41-year-old member asked:
Dr. Kevin Lingle
Cardiology 15 years experience
Not a good idea: Usually weight loss supplements contain ingredients that raise your blood pressure. Vit B12 should be ok.
A 34-year-old female asked:
Dr. Gurmukh Singh
Pathology 49 years experience
No: Vitamin B 12 injection will get it into the blood and other organs where it is needed.
A 35-year-old female asked:
Dr. Zachary Veres
Family Medicine 18 years experience
B12: depending on how low your b12 level is will tell you whether you need oransupplements too. It won't hurt in the mean time

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