Review: could Vitamin B12 cause Rash?


Rash is found among people who take Vitamin B12, especially for people who are female, 60+ old , have been taking the drug for < 1 month, also take medication Vitamin D, and have Crohn's disease . We study 7,480 people who have side effects while taking Vitamin b12 from FDA and social media. Among them, 275 have Rash. Find out below who they are, when they have Rash and more.

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Vitamin B12

Vitamin b12 has active ingredients of cobalamin. It is often used in vitamin supplementation. (latest outcomes from Vitamin b12 7,665 users)


Rash has been reported by people with breathing difficulty, fever, pain, drug ineffective, itching (latest reports from 186,667 Rash patients).

On Aug, 25, 2016

7,480 people reported to have side effects when taking Vitamin B12.
Among them, 275 people (3.68%) have Rash

Number of reports submitted per year:

Could Vitamin b12 cause Rash?

Time on Vitamin B12 when people have Rash *:

  • < 1 month: 28.57 %
  • 1 - 6 months: 0.0 %
  • 6 - 12 months: 28.57 %
  • 1 - 2 years: 14.29 %
  • 2 - 5 years: 14.29 %
  • 5 - 10 years: 14.29 %
  • 10+ years: 0.0 %

Gender of people who have Rash when taking Vitamin B12 *:

  • female: 67.04 %
  • male: 32.96 %

Age of people who have Rash when taking Vitamin B12 *:

  • 0-1: 0.0 %
  • 2-9: 1.88 %
  • 10-19: 0.47 %
  • 20-29: 0.94 %
  • 30-39: 8.45 %
  • 40-49: 15.49 %
  • 50-59: 24.88 %
  • 60+: 47.89 %

Severity if Rash when taking Vitamin B12 **:

  • least: 12.5 %
  • moderate: 50.0 %
  • severe: 37.5 %
  • most severe: 0.0 %

How people recovered from Rash **:

  • while on drug: 0.0 %
  • after off the drug: 16.67 %
  • not yet: 83.33 %

Top conditions involved for these people *:

  • Crohn's Disease (34 people)
  • Hypertension (32 people)
  • Rheumatoid Arthritis (29 people)
  • Pain (26 people)
  • Gastrooesophageal Reflux Disease (21 people)

Top co-used drugs for these people *:

  • Vitamin D (52 people)
  • Folic Acid (48 people)
  • Humira (36 people)
  • Vitamin C (33 people)
  • Aspirin (33 people)

* Approximation only. Some reports may have incomplete information.

** Reports from social media are used.

How to use the study: print a copy of the study and bring it to your health teams to ensure drug risks and benefits are fully discussed and understood.

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