Nov 30, 2021 · While vitamin B allergies aren't common, it's still possible to have a reaction to the nutrient if your immune system mistakenly identifies it as harmful and attacks, which can lead to symptoms like rashes, swelling, itching or hives (raised, red welts), according to the Mayo Clinic.

Jul 16, 2024 · Skin Rash. A very common problem but also an early sign of vitamin B12 in your body is skin rash. This can appear itchy and with red patches on your skin and sometimes it can accompanied by...

Sep 13, 2024 · Large doses of vitamin B12 can trigger a cobalt allergy. That may cause a red, painful rash called contact dermatitis. Most cobalt exposure is from makeup, industrial uses, and B12 supplements.

Sep 25, 2023 · A vitamin B12 deficiency skin rash often appears as itchy, reddened patches on the skin. It's crucial to recognize the symptoms early and to understand that while a rash might be the most visible sign, other internal symptoms can arise due to vitamin B overdose.

Feb 1, 2025 · High levels of vitamin B12 have been associated with several dermatological symptoms, such as: Maculopapular rashes: Flat or raised red spots on the skin. Pruritus (itchiness): Persistent itching without an obvious external cause. Hives (urticaria): Swollen, pale-red welts that appear suddenly and may itch intensely.

Nov 22, 2024 · Learn about the side effects of Vitamin B12 (cyanocobalamin), from common to rare, for consumers and healthcare professionals.

Cobalt is one of the components of vitamin B12, also known as cobalamin. Patients with allergic contact dermatitis who receive vitamin B12 replacement have been reported to experience a variety of cutaneous reactions, including chronic vesicular hand dermatitis, cheilitis and stomatitis.

Vitamin B12 is necessary for the production of DNA, a process that occurs in every cell. Not surprisingly, vitamin B12 deficiency has a number of effects in the body. The most common skin changes are areas of darkened skin -- hyperpigmentation -- or lightened skin -- hypopigmentation.

Feb 24, 2025 · Vitamin B12 can cause very rare but serious allergic reactions, or anaphylaxis. If this occurs after you take vitamin B12, call 911 or your local emergency services immediately. Vitamin B12...

Sep 28, 2024 · One of the most frequently reported side effects is a reaction at the injection site. This can manifest as redness, swelling, and sometimes pain. Such reactions are generally mild and resolve within a few days. However, persistent or severe reactions should be evaluated by a healthcare professional.