Skip to content

Vitamin B12 for Healthy Hair- A Comprehensive Guide


When achieving luscious, healthy hair, you must look beyond expensive shampoos and conditioners. Your diet and the nutrients you provide to your body play a significant role in the health of your hair. Vitamin B12 for hair is crucial in promoting strong and vibrant locks among the essential vitamins and minerals. In this blog, we'll explore the intricate connection between Vitamin B12 and your hair, from the basics of this vital nutrient to the biology of hair growth.

What is Vitamin B12? 

Vitamin B12, also known as cobalamin, is a water-soluble vitamin belonging to the B-vitamin family. It has a complex chemical structure that includes a cobalt atom at its core. This unique structure makes it a coenzyme, pivotal in several critical bodily functions. Before we dive into Vitamin B12's role in hair health, it's worth noting that vitamin B12 is essential for overall health. It plays a role in:

  • Energy Production: Vitamin B12 helps convert food into energy, supporting various bodily functions.
  • DNA Synthesis: It's crucial for the formation and maintenance of our genetic material.
  • Red Blood Cell Production: B12 is essential for producing red blood cells, which transport oxygen throughout the body.
  • Nervous System Function: It contributes to the health of our nervous system, protecting nerve fibres with the myelin sheath.

Exploring the link: Vitamin B12 for Hair Health

Vitamin B12 for Hair is crucial as it affects every stage of the growth cycle. Hair growth isn't a continuous process; it occurs in cycles with distinct stages. Understanding these stages is vital for grasping the role of Vitamin B12 in the process.

  • Anagen (Growth) Phase: This is the active growth stage of hair, where new hair cells are produced. Vitamin B12 plays a crucial role here by promoting the health of hair follicles and ensuring they receive the nutrients they need to grow.
  • Catagen (Transitional) Phase: During this short phase, hair follicles shrink and detach from the blood supply. Adequate blood flow, supplied by red blood cells produced with the help of B12, is essential for a smooth transition.
  • Telogen (Resting) Phase: In this phase, hair remains in a resting state. A healthy scalp, supported by Vitamin B12, helps maintain the hair's strength and resilience during this period.

Role of Vitamins and Minerals in the Hair Growth Process

Vitamins and minerals, including B12, play a significant role in maintaining the health of your hair. As mentioned earlier, B12 supports red blood cell production, ensuring hair follicles receive the oxygen and nutrients they need to thrive. Without sufficient B12, the hair growth cycle can be disrupted, leading to issues like thinning, hair loss, or premature greying. Remember, a well-balanced diet that includes B12-rich foods, or supplementation if needed, can be your secret weapon for achieving the hair of your dreams.

How Vitamin B12 for Hair is important

Vitamin B12 is a powerhouse when it comes to promoting hair health. This water-soluble vitamin plays a vital role in several ways:

  • Direct Impact on Hair Follicles: Vitamin B12 is essential for forming red blood cells, which carry oxygen and nutrients to the hair follicles. Adequate blood flow to the scalp ensures hair follicles receive the nutrients they need to grow and thrive.
  • Red Blood Cell Production and Its Connection to Hair Health: Vitamin B12 is a critical component in the production of red blood cells. These red blood cells carry oxygen throughout the body, including to the hair follicles. Red blood cell production can be compromised when there is a deficiency of B12, leading to decreased oxygen delivery to the hair follicles. As a result, the hair may become weak, thin, and brittle.

Consequences of Vitamin B12 Deficiency

  • Hair Thinning: Insufficient Vitamin B12 for hair can lead to hair thinning, where the hair strands become finer and more prone to breakage.
  • Hair Loss or Alopecia: A lack of Vitamin B12 can lead to hair loss or alopecia in more severe cases. This is often characterised by noticeable hair shedding and bald patches.
  • Premature Greying: While greying hair is a natural part of ageing, a B12 deficiency can accelerate the greying process, leading to premature greying.
  • Other Associated Symptoms: Vitamin B12 deficiency is not limited to hair issues. It can also cause fatigue, weakness, and neurological symptoms, including numbness, tingling, and difficulty with balance and coordination.

Scientific Research on Vitamin B12 and Hair Health

Several studies have explored the relationship between Vitamin B12 for hair health, shedding light on the significance of this connection.

National Library of Medicine, in its study on the Role of Vitamins and Minerals in hair loss, suggests that Iron, vitamin D, folate, vitamin B12, and selenium are vitamins and minerals that may be involved in hair greying/whitening during childhood or early adulthood. Supplementing these deficient micronutrients can improve premature greying.

Many studies have found a strong association between low levels of Vitamin B12 and premature greying of hair. It highlighted the importance of adequate B12 intake to delay or prevent premature greying.

The Chemical Structure of Vitamin B12

Vitamin B12 is a complex molecule with a unique chemical structure. It is a member of the B-vitamin family, which includes eight different B-vitamins, each with specific bodily functions. Its cobalt atom at its centre distinguishes vitamin B12, hence the name "cobalamin." This cobalt atom is surrounded by a corrin ring, a complex macrocyclic structure that plays a critical role in Vitamin B12's ability to function as a coenzyme.

The most common and stable form of Vitamin B12 used in supplements and fortified foods is cyanocobalamin, which contains a cyanide molecule. While this may sound concerning, the small amount of cyanide in cyanocobalamin does not harm the human body. The body converts cyanocobalamin into biologically active forms, making it a reliable source of Vitamin B12.

Apart from cyanocobalamin, other forms of Vitamin B12 include hydroxocobalamin and methylcobalamin. Methylcobalamin, in particular, is highly important for some crucial processes in the body.

Different Forms of B12

Cyanocobalamin: This synthetic form of Vitamin B12 is commonly found in supplements and fortified foods. The body converts it into active forms, making it a suitable supplement option.

Methylcobalamin: This is the active form of Vitamin B12, readily available for the body. It plays a vital role in various metabolic processes.

Hydroxocobalamin: This form is often used in medical treatments for Vitamin B12 deficiency, as it has a longer duration of action in the body.

Natural Sources of Vitamin B12 for hair

Vitamin B12 is naturally found in various foods, with animal-based sources being the most abundant and bioavailable. However, there are some plant-based sources, and many fortified foods are available for vegetarians and vegans.

Animal-Based Sources of Vitamin B12 

  • Meat: Beef, chicken, and fish are rich sources of Vitamin B12.
  • Dairy Products: Milk, cheese, and yogurt contain substantial Vitamin B12.
  • Eggs: Especially the yolk, which is a good source of this vitamin.
  • Seafood: Shellfish like clams, mussels, and oysters are exceptionally rich in B12.

Plant-Based Sources and Fortified Foods

  • Fortified Plant-Based Milk: Almond, soy, and rice milk, fortified with B12, offer a suitable alternative for vegans.
  • Nutritional Yeast: This is a popular source of Vitamin B12 for vegans and is often used as a cheese substitute in vegan dishes.
  • Fortified Cereals: Many breakfast cereals are fortified with Vitamin B12.
  • Supplements: Vitamin B12 supplements are available in various forms, making it easy for vegetarians and vegans to meet their daily requirements.

The Role of Vitamin B12 in the Body

Energy Production: Vitamin B12 is a key player in the process of converting food into energy. It helps the body break down carbohydrates and fats, providing the necessary fuel for our cells and organs.

DNA Synthesis: Vitamin B12 is crucial for synthesising our cells' genetic material. This is essential for the growth and maintenance of all our cells and is particularly important during periods of rapid cell division, such as pregnancy and childhood.

Red Blood Cell Formation: Vitamin B12 is essential for producing red blood cells. A deficiency in B12 can lead to anaemia, which causes fatigue and weakness due to the body's inability to transport oxygen effectively.

Nervous System Function: B12 is essential for the health of our nervous system. It is involved in forming the protective myelin sheath that surrounds nerve fibres. A deficiency can lead to neurological symptoms like tingling, numbness, and even more severe issues in the long term.

Vitamin B12 is a vital nutrient that plays an essential role in the body, from energy production to DNA synthesis, red blood cell formation, and nervous system function. Individuals of all ages and dietary preferences must meet their daily Vitamin B12 requirements to maintain overall health and well-being. Whether you're an omnivore or follow a plant-based diet, options are available to ensure you get the B12 your body needs to thrive.

Why Supplement with Vitamin B12 for Hair?

Vitamin B12 is more than just a dietary staple; it's a key player in maintaining the health of your hair. Here's why it's beneficial:

Supports the Hair Growth Cycle: Vitamin B12 promotes hair growth by ensuring that hair follicles receive the nutrients and oxygen they need to thrive during the anagen (growth) phase of the hair cycle.

Strengthens Hair Follicles: B12 supports the health of your hair follicles, preventing them from becoming weak and brittle. This leads to stronger and more resilient hair.

Prevents Premature Graying: Adequate Vitamin B12 intake can help delay or prevent premature graying, keeping your hair color vibrant for longer.

Who Should Consider taking Vitamin B12 Supplements for Hair? 

Supplementation is essential if you've been diagnosed with a Vitamin B12 deficiency. Deficiency can lead to various hair issues, from thinning to hair loss. Moreover, those who prefer plant-based diets often lack adequate B12, making supplementation a wise choice for those who avoid animal products. Fortified foods and B12 supplements can help ensure you meet your daily requirements. Additionally, elderly individuals might benefit from the supplements as our bodies become less efficient at absorbing B12 from food. 

Choosing the Right B12 Supplement for Hair Health

Oral vs. Injectable: Vitamin B12 supplements are available in various forms, including oral capsules, tablets, and injectable forms. Oral supplements are convenient and work well for most people. Injectable B12 is usually reserved for individuals with severe deficiencies or absorption issues.

Dosage Considerations: The appropriate dosage of Vitamin B12 can vary based on individual needs and circumstances. For general hair health, the recommended dietary allowance (RDA) is 2.4 micrograms per day for adults.

Potential Side Effects of Excess Vitamin B12 Intake

While Vitamin B12 is generally considered safe, consuming excessive amounts can have side effects. These might include:

  • Skin Issues: High doses of B12 may lead to skin problems, such as acne or rashes.
  • Digestive Upset: Overconsumption can cause gastrointestinal discomfort, including nausea, diarrhoea, or cramps.
  • Sleep Disturbances: Some individuals have reported sleep disturbances after taking high doses of B12.

Interactions with Other Medications or Nutrients

Vitamin B12 can interact with other medications or nutrients, affecting their absorption and efficacy. For example:

  • Proton Pump Inhibitors (PPIs): These medications, used to reduce stomach acid, can reduce the absorption of Vitamin B12.
  • Metformin: This common diabetes medication may lower B12 levels in the body.
  • Zinc: High zinc intake can reduce the absorption of Vitamin B12.

Signs of Vitamin B12 Overdose

Vitamin B12 overdose is rare because it's a water-soluble vitamin and excess amounts are typically excreted in the urine. However, if you experience the following symptoms after consuming large amounts of B12, contact a healthcare professional:

  • Nausea and Vomiting: Excessive B12 intake can cause nausea and vomiting.
  • Skin Reactions: Allergic skin reactions, such as itching or rashes, can occur.
  • Difficulty Breathing: In severe cases, B12 overdose can lead to difficulty breathing or anaphylaxis.

For most adults, the recommended dietary allowance (RDA) for Vitamin B12 is 2.4 micrograms daily. It's important to talk to your medical advisor for personalised recommendations.

Tips for Maintaining Optimal Vitamin B12 Levels for Hair Health

  • Balanced Diet: Ensure you include B12-rich foods like meat, dairy, eggs, and fortified products in your diet.
  • Supplementation: If you have a diagnosed deficiency or are following a vegetarian or vegan diet, consider Vitamin B12 supplements.
  • Regular Check-ups: Periodically monitor your B12 levels, primarily if you have known risk factors for deficiency.

Dietary and Lifestyle Changes to Support Hair Health

Optimal hair health goes beyond just Vitamin B12. One must consider these dietary and lifestyle changes to support your hair along with optimal consumption of Vitamin B12. 

  • Protein-Rich Diet: Hair is primarily composed of protein. Ensure you consume enough high-quality protein sources like lean meats, fish, beans, and nuts.
  • Hydration: Staying well-hydrated supports hair health by keeping it moisturised and promoting a healthy scalp.
  • Stress Management: Chronic stress can negatively impact hair. Engage in stress-reduction practices like meditation, yoga, or exercise.

Vitamin B12 is a valuable ally in your quest for healthy hair, but it's important to use it responsibly. By staying within recommended intake levels, understanding potential interactions, and making dietary and lifestyle choices that promote overall health, you can ensure that Vitamin B12 works its magic on your hair without the risks. 

Key Takeaways: 

Vitamin B12 is more than a vitamin; it's a powerful catalyst for promoting the health and vibrancy of your hair. It supports the hair growth cycle, ensuring your hair follicles have the nutrients and oxygen needed to thrive. It strengthens these follicles, preventing them from becoming weak and brittle. Additionally, adequate Vitamin B12 intake can even delay or prevent the onset of premature greying, maintaining your hair's natural colour for longer.

While Vitamin B12 is a valuable resource in your quest for healthy hair, it's crucial to consult with your doctor before diving into any supplementation regimen. This step ensures you make informed decisions tailored to your needs and circumstances.

Ultimately, the harmonious balance of a well-rounded diet, smart lifestyle choices, and expert guidance will unlock the secret to the healthy and beautiful hair you desire. With Vitamin B12 as a supportive partner, you're on your way to achieving those luscious hair you've always dreamed of.

Frequently Asked Questions: 

Q: How does Vitamin B12 compare to other vitamins in promoting hair growth?

A: Vitamin B12 is essential for hair health, as it plays a role in the formation of red blood cells, which carry oxygen and nutrients to hair follicles. However, it's not the primary vitamin associated with hair growth. Other vitamins like biotin, niacin, and folic acid are also crucial for healthy hair. A balanced intake of various vitamins and minerals is essential for optimal hair growth, and deficiency in any of these nutrients can potentially lead to hair problems.

Q: Are there specific hair products that contain Vitamin B12? If so, are they effective?

A: Yes, some hair products, such as shampoos and conditioners, may contain Vitamin B12. However, the effectiveness of these products in promoting hair growth is often limited. This is because Vitamin B12 primarily affects hair health when ingested through a balanced diet or supplements. Topical application of Vitamin B12 may have some benefits for the scalp and hair, but the impact is generally not as significant as dietary intake.

Q: How long does it take to notice hair improvements after starting Vitamin B12 supplements?

A: The time it takes to notice hair improvements after starting Vitamin B12 supplements can vary from person to person. Typically, it may take several weeks to a few months before visible changes in hair quality and growth become apparent. The duration depends on various factors, including the severity of any pre-existing Vitamin B12 deficiency, individual metabolism, and overall health.

Q: Can high doses of Vitamin B12 cause hair loss?

A: High doses of Vitamin B12 are unlikely to cause hair loss. In fact, Vitamin B12 is essential for hair health, and a deficiency can potentially lead to hair problems. However, excessive intake of Vitamin B12 through supplements or injections is generally not recommended unless advised by a healthcare professional. A balanced and moderate intake of Vitamin B12 is important for overall health and can support healthy hair.

Q: Are there topical applications of Vitamin B12 for hair, and do they work?

A: Topical applications of Vitamin B12 for hair do exist, such as serums or creams. These products may have some benefits for scalp health and potentially contribute to healthier hair. However, their effectiveness in promoting significant hair growth is debated. The primary source of Vitamin B12 for hair health is through dietary intake or supplements, as the vitamin is absorbed systemically when ingested.

Q: Is there a difference in hair benefits between natural dietary Vitamin B12 and supplements?

A: Both natural dietary Vitamin B12 from food sources and Vitamin B12 supplements can provide benefits for hair health. The body absorbs and utilizes Vitamin B12 similarly from natural dietary sources and supplements. If a deficiency is impacting hair health, supplements may be necessary to address the problem more quickly. However, obtaining a variety of nutrients through a balanced diet is generally more beneficial for overall health and can indirectly support healthy hair.


Zahra Lokhandwala

Hair Coach

Zahra is the hair coach-in-chief at Traya. She works closely with the doctors to monitor all cases. She is a fitness freak and has not touched sugar in years!

Popular Posts

Leave a comment

Please note, comments need to be approved before they are published.

What's Causing Your Hair Fall?

Take Traya's FREE 2-minute hair test, designed by doctors that analyses 20+ factors like genetics, scalp health, lifestyle, and hormones, to identify the root causes of your hair fall.

Take The Free Hair TestTM