Cyanocobalamin 50mcg (B12) 50 tablets
Cyanocobalamin 50mcg (B12) 50 tablets Product information
£3.59 (£0.00 per )
Buy Cyanocobalamin for Vitamin B12 Deficiency
Your body needs enough B12 to make red blood cells, build DNA and keep your nervous system healthy and functioning properly (1). B12 also plays a key role in energy production, helping the body convert the food you eat into usable energy, and it supports healthy brain function, including memory and concentration. Because your body can't produce B12 on its own, you need to get it from your diet, mainly from animal products such as meat, fish, eggs and dairy, or from supplements (1,2).
Cyanocobalamin 50mcg is a high strength form of vitamin B12, used to prevent and treat B12 deficiency. It's a synthetic form of B12 that's converted by the body into the active forms it needs, and it's widely used in supplements because it's stable and easy for the body to absorb.
Product Information for Cyanocobalamin 50mcg (B12) 50 tablets
What is Cyanocobalamin/Vitamin B12?
Cyanocobalamin is a synthetic (man-made) form of vitamin B12. B12 is essential for red blood cell formation, nervous system support, and overall energy levels, and these tablets are ideal for those with low B12 intake or absorption issues (1).
What is vitamin B12 deficiency and why does it happen?
Vitamin B12 deficiency is when your body does not have enough vitamin B12 to support the essential functions it is used for, such as making healthy red blood cells or keeping your nervous system functioning (1).
B12 deficiency can happen if you don’t eat enough foods containing B12, or if your body can’t absorb B12 properly. This can happen for a range of reasons, such as if you have certain condition that affect your stomach or small intestine, such as Crohn’s disease or coeliac disease. Long-term use of some medications, including proton pump inhibitors like omeprazole, or Metformin for diabetes, can also affect B12 absorption (2).
Symptoms of B12 deficiency
How do you know if you are deficient in Vitamin B12? There are some signs and symptoms of B12 deficiency to be aware of. These include (2):
Rapid breathing or shortness of breath
Headaches
Indigestion
Loss of appetite
Heart palpitations (where your heart beats more rapidly than normal)
Problem with your eyesight
Feeling weak or tired
Diarrhoea
A sore, red tongue which may be accompanied by mouth ulcers
Problems with memory, understanding and judgement
It’s important to be aware that these are also symptoms of general folate deficiency too. Vitamin B deficiency can also affect how your brain and nervous system works, and this can cause symptoms such as:
Numbness and/or weakness in different parts of your body
Sensations of pins and needles
Psychological problems, ranging from mild anxiety and depression to confusion and even dementia
Problems with balance and coordination
Incontinence
If you are experiencing these symptoms, it is important to speak to your GP to ask about the possibility of B12 deficiency (3). In most cases, B12 deficiency can be diagnosed through asking about your symptoms and a simple blood test.
How is B12 linked to hair loss?
Your hair relies on a healthy supply of red blood cells bringing oxygen-rich blood to your scalp and hair follicles (4). If you are B12 deficient, your hair follicles may not receive the blood that they need to create strong, healthy hair.
Read more about if B12 deficiency causes hair loss.
If you are diagnosed with a vitamin B12 deficiency and you are experiencing hair loss, you may be a good candidate for Cyanocobalamin tablets
B12 tablets vs injections
B12 is available in both tablet and injection form, so how do you know which is best for you? Both can replace vitamin B12 effectively, and the best option usually comes down to why your B12 is low, how well you can absorb it and which is the most convenient and affordable treatment option in your personal circumstances.
B12 Tablets | B12 Injections | |
|---|---|---|
How they work | Taken by mouth, usually every day. | Given into a muscle by a healthcare professional. |
Suitability | If you can absorb normally, but you aren’t getting enough B12 through your diet. | Most appropriate if you have problems absorbing B12 and have moderate to severe symptoms of deficiency. |
Advantages | Convenient, avoids needles, usually less expensive. | Bypasses your digestive system as absorbed straight into your bloodstream. |
Potential disadvantages | Must be taken consistently. Natural absorption must be good. | Requires appointments with a healthcare professional, can be uncomfortable. |
Clinical studies show that high-dose daily oral B12 can raise and maintain blood levels just as effectively as injections for general deficiencies over time (5).
Cyanocobalamin 50mcg (B12) 50 tablets reviews
How to use Cyanocobalamin 50mcg (B12) 50 tablets
Cyanocobalamin 50mcg tablets should be swallowed with water and taken between meals (6).
The usual dose for adults is between one and three tablets daily but always follow the dosing instructions provided by your prescriber (6).
What do I do if I miss a dose?
If you forget to take your Cyanocobalamin tablet, take your next dose as soon as you remember if it is within a few hours of the usual time. Otherwise, leave that dose and take your next dose at the normal time. Do not take a double dose to make up for a missed dose (6).
Storing your medicine
Keep this medicine out of the sight and reach of children.
Store below 25ºC.
Store in the original package to protect from light and moisture.
Do not use this medicine after the expiry date which is stated on the label after EXP. The expiry date refers to the last day of that month.
Do not throw away any medicines via wastewater or household waste. Ask your pharmacist how to throw away medicines you no longer use. These measures will help protect the environment.
Side effects of Cyanocobalamin 50mcg (B12) 50 tablets
Although most people have no side effects from Cyanocobalamin tablets, you should still be aware that they could occur (7). Acne-like and blister rashes have been reported but are rare (6).
Cyanocobalamin contains cobalt. If you are allergic to cobalt, or any of the other ingredients the vitamin contains, you shouldn’t use it. If you do, it could cause a reaction. The symptoms of this reaction could start straight away, or up to three days later (7).
If you notice any signs of an allergic reaction, including an itchy rash, sudden swelling of your face, neck, mouth, throat or tongue, or difficulty breathing, get medical help right away (6,7).
Please note that taking this medication without a proper diagnosis could mask an underlying condition. Always speak to your prescriber for accurate health advice.
Note for women of child-bearing age, and those pregnant or breastfeeding
If you are pregnant, planning to become pregnant or breastfeeding, let your prescriber know before you start taking vitamin B12 (6).
Cyanocobalamin: interactions with other medications
In addition to cobalt, Cyanocobalamin contains lactose (which is a sugar). If you have an intolerance to some sugars, get advice from your prescriber before taking this medication. Because lactose is dairy derived, Cyanocobalamin is also not suitable for vegans.
You should also speak to your doctor/prescriber before taking vitamin B12 medication if you are taking or have recently taken any other medications. This is because some can affect how well cyanocobalamin is absorbed, including:
Neomycin and chloramphenicol, which are antibiotics
Colchicine, a treatment for gout
Biguanides, such as metformin which is used to treat diabetes
Cholestyramine, a medication used to reduce the amount of fat in your blood
Potassium chloride, used to correct potassium deficiency
Methyldopa, a treatment for high blood pressure
Cimetidine, used to treat excess stomach acid
Oral contraceptives
It’s also important to note that antibiotics and antimetabolites, which are used to treat some cancers, can affect the blood test that will be used to diagnose a Vitamin B12 deficiency (6).
Important - Before taking any medication, it is always important to read the Patient Information Leaflet (PIL)
Cyanocobalamin 50mcg (B12) 50 tablets - Patient Information Leaflet
HS. B Vitamins and Folic Acid - Vitamins and Minerals [Internet]. NHS. 2020 Aug [cited 2026 Aug 9]. Available from: https://www.nhs.uk/conditions/vitamins-and-minerals/vitamin-b/
NHS. Causes - Vitamin B12 or folate deficiency anaemia [Internet]. NHS. 2023 [cited 2026 Aug 9]. Available from: https://www.nhs.uk/conditions/vitamin-b12-or-folate-deficiency-anaemia/causes/
NHS Choices. Symptoms - vitamin B12 or folate deficiency anaemia [Internet]. NHS. 2019 May [cited 2026 Aug 9]. Available from: https://www.nhs.uk/conditions/vitamin-b12-or-folate-deficiency-anaemia/symptoms/
Kato H, Kinoshita K, Saito N, Kanayama K, Mori M, Asahi N, et al. The Effects of Ischemia and Hyperoxygenation on Hair Growth and Cycle. Organogenesis. 2020 July 2;16(3):83–94. https://pmc.ncbi.nlm.nih.gov/articles/PMC7531622/
Wang H, Li L, Qin LL, Song Y, Vidal-Alaball J, Liu TH. Oral vitamin B12 versus intramuscular vitamin B12 for vitamin B12 deficiency. Cochrane Database of Systematic Reviews. 2018 Mar 15;(3) [cited 2026 Aug 9]. https://pmc.ncbi.nlm.nih.gov/articles/PMC6494183/
Mercury Pharma Group Ltd. Cyanocobalamin 50 micrograms tablets: patient information leaflet [Internet]. London: Mercury Pharma Group Ltd.; 2025 Oct [cited 2026 Aug 9]. Available from: https://www.medicines.org.uk/emc/files/pil.5716.pdf
NHS Choices. Side effects of cyanocobalamin. 2024 [cited 2026 Aug 9]. Available from: https://www.nhs.uk/medicines/cyanocobalamin/side-effects-of-cyanocobalamin/
Almohanna HM, Ahmed AA, Tsatalis JP, Tosti A. The Role of Vitamins and Minerals in Hair Loss: A Review. Dermatology and therapy [Internet]. 2019 [cited 2026 Aug 9];9(1):51–70. Available from: https://www.ncbi.nlm.nih.gov/pubmed/30547302
Telogen effluvium [Internet]. Bad.org.uk. 2020 [cited 2026 Aug 9]. Available from: https://www.bad.org.uk/pils/telogen-effluvium
- Vitamins to take in the Summer months
- Feel Your Best: Vitamin Supplements Guide
- How to get your 5 a day
- Vitamins to keep you supple
- Living with Coeliac disease (Gluten intolerance)
- Save on Your Treatment This January
- How blood affects erections: the science behind erectile dysfunction
- Why do ED medicines work for some people but not others?
- How do GLP-1 side effects compare between treatments?
- What is the Black Market for Prescription Medication?
Authored on September 14, 2026
Robert Bradshaw (Pharmacist) — MRPharms BSc(Hons) Pharmacy
Superintendent Pharmacist
GPhC Number: 2036118
GMC Number: 20399999
Reviewed on September 16, 2026
