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Vitamin B12 Tablets

1 tablet per day


Designed to support everyday energy and vitality. Ideal for busy lifestyles, vegetarians and vegans…
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  • days supply
  • 1.37p/tablet
  • compostable
  • vegan

Contributes to general energy production


- +

This Vitamin Supports

  • brain
  • energy
  • eye health
  • immunity


Each one-a-day tablet contains 10µg of Vitamin B12.

B12 is one of the most important vitamins, contributing to normal energy-yielding metabolism, the reduction of tiredness and fatigue, normal psychological function, and the normal function of the immune system.

Our Vitamin B tablets are ideal for giving your brain and body an energy boost. Better still, you can take advantage of low prices and ingredients from quality sources. 

Vegan Friendly


Swallow one tablet daily, with food or as advised by your healthcare practitioner. Do not exceed the stated daily intake.


Food supplements should not be used as a substitute for a balanced and varied diet and a healthy lifestyle. Not suitable for children under the age of 12. If pregnant, breastfeeding or on medication, please consult a health professional before use. Discontinue use and seek medical advice if adverse reactions occur.


Store in a cool, dry place out of the sight and reach of children. For best before end date, see product.

Bulking Agents (Calcium Carbonate, Microcrystalline Cellulose), Maltodextrin, Anti-Caking Agents (Magnesium Stearate, Silicon Dioxide), Cyanocobalamin

Supplements to support everyday energy and vitality. Ideal for busy lifestyles, vegetarians and vegans

Vitamin B12 (also known as cobalamin) supports numerous bodily functions, including the brain and red blood cell production. However, as the body doesn't produce vitamin B12 naturally, people need to get their recommended intake through diet or supplements.

If you don't get enough vitamin B12 through diet alone, supplements can nourish your body and help you avoid the effects of a deficiency.

Sealions is fully committed to offering value for money without compromising on quality. Costing just £5.00 for a year's supply, you can prioritise your health and look forward to excellent savings.

Why does the body need Vitamin B12?

As an essential vitamin to ensure normal bodily functions, if you suffer with a deficiency you'll feel the effects. Various food sources contain B12, including:

  • Trout and salmon
  • Liver and beef
  • Dairy products
  • Eggs
  • Plant-based milk
  • Fortified breakfast cereals

Consuming a vegetarian or vegan diet can make you particularly susceptible to a deficiency as the foods that contain vitamin B12 are limited.

However, some people are naturally at risk of developing a deficiency due to certain conditions and lifestyle choices, including:

  • Failing to consume a balanced diet
  • People with Type 1 diabetes
  • Chron's disease
  • HIV
  • Inherited deficiency from family members
  • Older adults
  • The effects of Vitamin B12 deficiency

    People with low levels of B12 may experience a range of side effects that make it hard to function and perform daily activities. Some people's symptoms might be minor, while others can experience side effects that could impact their ability to work.

    Fatigue and weakness

    Some people with low vitamin B12 levels feel tired all the time and experience weakness when performing daily activities. If things like climbing the stairs make you feel faint, or you struggle to stay awake throughout the day, it could be a sign that your levels are low.


    Vitamin B12 is instrumental in producing red blood cells, and a deficiency often leads to megaloblastic anaemia, causing weakness, pale skin and shortness of breath. If you have this condition you could require regular B12 injections and folic acid supplements.

    Numbness or tingling

    Some people with the deficiency develop neuropathy, which can cause a tingling sensation in the extremities. The side effects of neuropathy include numbness, weakness and problems when trying to balance.

    Memory problems

    Cognitive issues like memory loss, difficulty concentrating, and mental fogginess are also associated with a B12 deficiency. Older adults with low levels of B12 may be misdiagnosed with dementia, highlighting how severe a deficit can get if left untreated.

    Mood changes

    B12 deficiency is also known to affect your mood, leading to irritability, a lack of motivation, feeling overwhelmed, and even developing depressive symptoms. In the most severe cases, people can also experience psychosis.

    The benefits of taking Vitamin B12 tablets

    If you're worried you don't get enough vitamin B12 from diet alone, adding a daily supplement could positively affect your overall health and state of mind.

    Here are the main benefits of taking our B12 tablets:

    Energy production

    Vitamin B12 is crucial in converting food into energy, helping the body metabolise fats and carbohydrates. However, when this function doesn't work properly, your body could struggle to utilise food sources, making you feel weak and tired.

    Giving your body a daily dose of this vitamin can give you more energy and reduce the effects of weakness from general activities.

    Brain health

    The brain is the body's most complex organ, and studies have proven that low levels of vitamin B12 can have a negative effect on how the brain and nervous system function (NCBI). Taking a supplement can enhance cognitive function and reduce the risk factors for neurological disorders.

    You can also boost the production of myelin by increasing your B12 intake. Myelin forms a protective sheath around the cells, preventing nerve damage.

    Red blood cell formation

    B12 is vital for the production of red blood cells. Without it, the cells risk becoming enlarged, and they won't be able to carry as much oxygen around the body. Megaloblastic anaemia is treatable, especially if you act early.

    Taking B12 tablets can help prevent and treat this condition while reducing your need for regular injections in the future.

    Heart health

    Cardiovascular disease is the second largest cause of death in the UK, with Alzheimer's and Dementia in first place. A study published by Wockhardt Hospitalsshows the link between B12 and coronary heart disease, but vitamin supplementation can reduce these risks.

    Homocysteine is an amino acid that can increase the chances of heart attacks and strokes by narrowing the arteries. However, some specialists believe that a range of B vitamins, including B12, offer homocysteine-lowering interventions, but there's not enough research to prove this definitively.

    Supports mental and physical well-being

    Some studies - such as the one published by the National Library Of Medicine, suggest that B12 plays a role in reducing the symptoms of melancholic depression. However, research is limited to non-melancholic depression.

    Digestive health

    Some individuals, particularly older adults, may have difficulty absorbing B12 from food due to digestive issues or a lack of intrinsic factor, a protein necessary for B12 absorption.

    If you notice you frequently have an upset stomach, feel weak and have chest pains or a rapid heartbeat, it could be a sign that your body can't absorb B12 from food. In these cases, supplements could be especially beneficial.

    Pregnancy and breastfeeding

    Taking vitamin supplements during pregnancy and when breastfeeding can ensure healthy foetal development and stimulate breast milk production. Pregnant women should consume a healthy and balanced diet of fortified foods, fish, meat and dairy products.

    However, if you're vegan or are intolerant to certain foods, adding Vitamin B12 and folic acid supplements can give your body - and baby - additional support.

    Shopping with Sealions gives you:

    Access to unbelievable savings

    Did you know that most vitamin providers sell their products at massive profit margins? Not only does this mean you end up paying more than you should, but you also have to decide which dietary supplements are most important for your needs.

    Our B12 and other vitamin supplements come from the highest quality sources. The only difference is that we lower our margins to pass on savings to you.

    Zero ethical conundrums

    You know you need vitamins, but you can't help but notice the single-use plastic surrounding every formula. Every time you support your health, there's a risk to our marine life. Well, we founded Sealions to protect the environment and not use single-use plastic.

    All of our supplements come in a 100% compostable or 100% recyclable pouch, ensuring zero risk factors are associated with using them.

    A one-stop shop for all your vitamin needs

    Our supplements suit the entire family, with specialist formulations for men, women, seniors and children. However, we also offer essential nutrients for pets, so you can keep your furry friend happy with cost-effective supplements.

    Buy Vitamin B12 supplements today.

We offer four different shipping options for our customers in the UK, ranging from Free delivery to next day.

  • Standard delivery or Royal Mail from £1.49
  • Premium delivery from £2.49
  • Express delivery from £4.95
  • Scottish Highlands and Islands, Isle of Man and the Channel Islands from £4.99

Spend £20 or more and your order will qualify for FREE shipping.

We do our very best to process and dispatch orders on the same day when placed before 11.00am Monday-Friday.

Orders placed after this, may not be processed until the following working day (i.e. orders placed after this point on a Friday or over the weekend will be processed on the Monday [excluding Bank Holidays]).

For the full list of rates and locations we ship to please click here.

Full Nutritional Information

Per 1 tablet / %NRV*
*Nutrient Reference Value
**No NRV Established

Vitamin B12 10µg / 400%

Frequently Asked Questions (FAQ)

  • Why are Sealions vitamins so cheap?
    • All our Sealions products are on par with the quality of other major vitamin and supplement market leaders. We just do things differently here. We believe our customers should not have to front the standard high margins of vitamin products. Instead, we half our own margins, cut out the middle people and their high margins. End result? Quality vitamins at affordable prices for everyone. Happy days!

  • Where are Sealions products manufactured?
    • We source our ingredients from international and UK suppliers, and manufacture all our supplements here in Manchester, United Kingdom. Guaranteeing the products we make are of top quality for you and your family.

  • When/how should I take my Sealions vitamins?
    • Take one tablet/softgel per day, with food or as advised by your healthcare practitioner. Do not exceed the stated daily intake.

  • Which vitamins are Vegetarian?
    • All our vitamins are vegetarian except for Cod Liver Oil, Fish Oil, Glucosamine Sulphate and Evening Primrose Oil vitamin products.

  • Which Vitamins are Vegan-Friendly?
    • The following vitamin products are vegan-friendly: Ashwagandha Gummies, Charge Up Gummies, Night Time Gummies, Sesame Street Kids Multivitamin Gummies, Turmeric, Folic Acid 400µg, Green Tea Extract, Lactobacillus Acidophilus Probiotic 500 million CFU, Vegan Protein Powder, Vitamin B-Complex, Vitamin C (200mg), Vitamin C Orange Chewables (200mg), Vitamin K2 100µg, Vitamin B12, Iron, Vitamin C (500mg), Magnesium + B6, and Zinc.

  • Where should I store my vitamins?
    • Store your vitamin products in a cool, dry place out of direct sunlight and out of sight and reach of children. 

  • How many vitamins are in each pouch?
    • Our vitamins come in varying supplies ranging from 30 days all the way up to 365 days worth of vitamins, and you usually take one tablet/softgel per day. For our gummies range we recommend to chew two gummies daily.

  • Why can’t I just take vitamins and not eat nutritious food?
    • Vitamin and supplement products should not be used as a substitute for a balanced and varied diet and a healthy lifestyle.