What vitamin deficiency causes loss of smell?

Author: Dr. Lora Hayes  |  Last update: Friday, June 12, 2026

This study hypothesizes that there are significant associations between Vitamin D deficiency and smell and taste impairments, being higher among older people.

What nutritional deficiencies cause loss of smell?

Vitamin Deficiencies

Loss of taste and smell could be your body's way of telling you you're low in vitamins. Certain conditions and medications can cause you to be low in vitamins associated with smell and taste, like A, B6, B12, and zinc.

What vitamins help smell?

Treatment for the first patient consisted of vitamin D supplementation of 10 000 IU a day. Her serum D3 levels increased substantially over a period of 8 months, at which time she reported a marked improvement in her sense of smell.

Can B12 deficiency cause loss of smell?

That's not all that could have happened: a severe vitamin B12 deficiency can lead to deep depression, paranoia and delusions, memory loss, incontinence, loss of taste and smell, and more. Important: A B-12 deficiency can be permanently damaging.

Why do I suddenly lose my sense of smell?

Causes of lost or changed sense of smell

illnesses such as a cold, flu or COVID-19. sinusitis (sinus infection) an allergy, like hay fever. growths in your nose (nasal polyps)

Loss of Smell (Anosmia): THE Solution

How can I restore my sense of smell?

In most cases, treating the underlying condition improves your sense of smell. For example, if you have sinusitis, antibiotics can help clear up the infection. If certain medications affect your sense of smell, switching medications may help ease your anosmia symptoms.

Why have I never been able to smell?

Anosmia is the partial or full loss of smell. Anosmia can be a temporary or permanent condition. You can partially or completely lose your sense of smell when the mucus membranes in your nose are irritated or obstructed such as when you have a severe cold or a sinus infection, for example.

How do you feel if your B12 is low?

Symptoms may include:
  • Weak muscles.
  • Numb or tingling feeling in hands and feet.
  • Trouble walking.
  • Nausea.
  • Decreased appetite.
  • Weight loss.
  • Irritability.
  • Lack of energy or tiring easily (fatigue)

What are signs of low vitamin D?

What are the symptoms of vitamin D deficiency?
  • Muscle pain.
  • Bone pain.
  • Increased sensitivity to pain.
  • A tingly, “pins-and-needles” sensation in the hands or feet.
  • Muscle weakness in body parts near the trunk of the body, such as the upper arms or thighs.
  • Waddling while walking, due to muscle weakness in the hips or legs.

Can iron deficiency cause loss of smell?

One of the many factors affecting the quality of life is the sense of smell. In particular, the impact of the sense of smell on quality of life is greater in women[17]. In this study, we found that there was a significant loss of smell in patients with anemia.

How can I make my sense of smell stronger?

Get More Exercise and Watch Your Diet

There's research suggesting that the sense of smell is stronger after exercise. It's not known why this happens, but it may be because exercise produces chemicals that stimulate parts of the brain associated with smell.

How much vitamin A for loss of smell?

More recently, a double-blind placebo-controlled trial using oral vitamin A at the same dose as the previous study of 10,000 IU per day for 3 months was carried out in 52 patients with PVOL and post-traumatic smell loss. However, no obvious treatment effect for oral delivery was shown [63].

What are the symptoms of a B6 deficiency?

In adults, vitamin B6 deficiency can cause inflammation of the skin (dermatitis) and a red, greasy, scaly rash. The hands and feet may feel numb and prickling—like pins and needles. The tongue may become sore and red, and cracks may form in the corners of the mouth. People may become confused or irritable.

What supplements help you smell again?

Alpha lipoic acid, vitamin A supplements, and over-the-counter steroid nasal sprays may be helpful. Olfactory training can easily be done at home and has been the most helpful in promoting smell fibers to start working again. Dr.

What organ is affected by B12 deficiency?

The consequences and severity of B12 deficiency are variable depending on the degree of deficiency and its duration. Major organ systems affected include the blood, bone marrow and nervous system.

What autoimmune disease causes loss of smell?

Smelling is a critical sense utilized daily. Consequently, smelling impairment or anosmia may lead to a reduction in life quality. Systemic diseases and particular autoimmune conditions can impair olfactory function; among others are Systemic Lupus Erythematosus, Sjögren Syndrome, and Rheumatoid Arthritis.

What are the symptoms of low magnesium?

Magnesium deficiency can cause:
  • low appetite.
  • nausea and vomiting.
  • fatigue and weakness.
  • muscle spasms or tremors.
  • abnormal heart rhythms.

How soon will I feel better after taking vitamin D3?

Key takeaways. It can take four weeks to four months of daily vitamin D supplementation to notice health improvements. The timeline is affected by factors like supplement type and individual health conditions.

How to flush vitamin D out of system?

Drinking plenty of water helps to support kidney function, allowing your body to naturally flush out excess vitamin D.

What are the facial signs of B12 deficiency?

The deficiency of vitamin B12 can cause specific skin manifestations, such as hyperpigmentation, vitiligo, angular stomatitis, and hair and nail changes [1].

What blocks B12 absorption?

Your body can't absorb B12 as well if all or part of your stomach or small intestine is taken out. That can happen if you have surgery for weight loss, cancer, or other health conditions. If you have surgery on your gastrointestinal tract, your doctor will want to keep an eye on your B12 levels.

What organ is responsible for smell?

The olfactory system is at the roof of the nasal cavity at the cribriform plate - a perforated portion of the ethmoid bone separating the frontal lobe of the cerebrum from the nasal cavity. Odorant molecules within the nasal passages first encounter receptors on the primary cilia of olfactory sensory neurons.

What diseases affect the sense of smell?

Problems with your chemical senses may be a sign of other serious health conditions. A smell disorder can be an early sign of Parkinson's disease, Alzheimer's disease, or multiple sclerosis. It can also be related to other medical conditions, such as obesity, diabetes, hypertension, and malnutrition.

Can you permanently lose your sense of smell?

Usually, anosmia and hyposmia improve once doctors have treated the cause. In some cases, loss of smell can be permanent. If you notice symptoms of anosmia, it is important to seek treatment right away. Delaying treatment may result in permanent smell loss.

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