High Vitamin B12 Levels And Thyroid | How Many Mg Of Vitamin B12 Per Day?

(Last Updated On: January 3, 2022)

Almost half of the patients with hypothyroidism have a vitamin B12 deficiency.

Vitamin B12 is expected for proper red blood cells production, cognitive function, and DNA synthesis.

I had earlier shared What Does Vitamin B Complex Do? | All About Vitamin B Complex I hope you read the post.

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Table of Contents

Thyroid symptoms

  • Investigation shows a high prevalence — about 40% of B12 deficiency in hypothyroid cases.

This prevalence may occur due to the high relation between anemia and hypothyroidism. Anemia is when your body has enough normal red blood cells to carry oxygen to your body’s tissue, causing weakness and tiredness.

Harmful anemia can impact the absorption of vitamin B12. In addition, supplementing with B12 may begin to increase the thyroid system.

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Improves cognitive function

A B12 deficiency may cause an increase of an amino acid in the blood and might decrease levels of people’s want to metabolize neurotransmitters.

Elevated thyroid levels are associated with cognitive impairment, and researches show that low vitamin B12 status is connected with more rapid cognitive decline.

However, supplementing with B12 may only be helpful for cognition if there is a nutritional deficiency of B vitamins.

A study in nutrition decided the effect of supplementing with folic acid and vitamin B12, vitamin B6 on cognitive function in women at higher risk of cardiovascular condition.

Apart from these plugins, I recommend you to read following posts that will help you: Enlargement Of Thyroid Glad: What To Do?

Improves energy level

Due to vitamin b12 role in energy metabolism, B12 is sometimes studied to improve energy, athletic performance, or strength.

Partially true, considering that correcting anemia induced by vitamin B12 deficiency may increase weakness symptoms.

It improves symptoms with already enough levels of the vitamin.

Vitamin B12 is water-soluble; your body cannot store more amounts of the vitamin. Instead, any excess passes through your body. So, if you lack vitamin B12, you may see an increase in energy levels.

To get started treatment, you’ll need to know: How Can I Boost My Immune System? | What Does The Immune System Protect The Body Against?

Risks of Vitamin B12 Consumption

Vitamin B12 does not have an Upper Intake Level defined as the daily intake level that is possible to act with no adverse effects—because of its low potential for toxicity.

People who take these medications should always talk to their doctor about vitamin B12 supplementation.

All of us should support our diet with several vitamins. We recommend Vitamin 12 supplements from the brand Amazon, especially for women. However, it is recommended for all.

Amazon Brand

Solimo Vitamin B12

For Normal Energy Production and Metabolism, Immune System Support

Vegan & Gluten-free


How many mg of vitamin b12 per day

The recommended daily intake for vitamin B12 for people over 14 is 2.4 mcg.

However, you may want to take more depending on your age, lifestyle, and specific condition.

See that the percent of vitamin B12 your body can absorb from supplements is not very high. For example, it’s estimated that your body only receives ten mcg of a 500-mcg B12 supplement.

Here are some suggestions for the B12 dose for specific details.

under age 50

For people over 13, the recommended daily take of vitamin B12 is 2.3 mcg.

Most people meet this condition through diet.

over 50 age

In one 8-week research in 100 older adults, combining 500 mcg of vitamin B12 normalized levels in 90% of participants. However, higher doses of up to 1,000 mcg (1 mg) may be necessary for some.

Pregnant women And breastfeeding women

Therefore, the Recommended Daily intake for vitamin B12 pregnancy is 2.6 mcg. 

vitamin b 12 for breastfeeding women is higher than that for pregnant women, namely 2.8 mcg 

Dont Forget To Read: Pregnancy Tips | Pregnancy Care

Vegetarians and vegans

Recommended Daily intake of 2.4 mcg for people under 50 years of age is much more challenging to meet on a vegetarian or vegan diet.

B12 for improved energy

Researchers recommended that those with vitamin B12 deficiency intake 1 mg of vitamin B12 daily for a month, followed by a 125–250 mcg per day maintenance dose.


Benefits of Vitamin B12

Vitamin B12 plays an essential part in cell production. So sufficient levels of this vitamin are required to promote healthy skin, hair, and nails.

Research shows that changing with B12 can improve dermatologic symptoms in people deficient in vitamin B12.

Blood cell production

Vitamin B12 deficiency may prevent red blood cells from developing correctly. Commonly red blood cells are small and round. 

However, in a vitamin B12 deficiency, they become larger, meaning that the red blood cells cannot pass from the bone marrow in the bloodstream at their usual rate.

A small percentage of people with a vitamin B12 deficiency may develop anemia when the body doesn’t have red blood cells to carry oxygen to vital organs. 

So, supplementing with vitamin B12 can help your body produce red blood cells.


Source of vitamin b-12

Dairy Products: Firstly, it has been found that 250 ml of milk contains about 1.2 – 2.4 of vitamin B12. Accordingly, it would help if you kept in mind that you must consume milk and milk-based food items like butter, cheese, curd, and cheese.

Fruits and Vegetables: Vitamin B12 from vegetables like Beetroot, Alfalfa, Butternut Squash. By consuming some fruits like apple, banana, mango, and orange, you can also meet the deficiency of vitamin B12.


Vitamin B12 plays many vital roles in your body.

Most people meet these requirements through nutrition alone, but older adults, people on strict plant-based nutrition, and those with digestive diseases may help from supplements. However, dosages vary based on individual needs.

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