How much selenium is toxic to horses?

In the case of selenium, more can be toxic. The upper safe total intake of selenium per day, based on the most recent National Research Council publication Nutrient Requirements of Horses, is 20 mg for an average 1,000-pound horse.

Can a horse have too much selenium?

Severe overdose of selenium can lead to death. In these severe cases, the signs of overdose may include a staggering gait, blindness, labored breathing, respiratory failure, collapse, and muscle tremors. Selenium status in horses can be measured using serum, plasma, or whole blood selenium levels.

What level of selenium is toxic?

In the published reports reviewed herein, serum selenium concentrations span the following ranges: 400–30,000 μg/L associated with acute toxicity, 500–1400 μg/L associated with chronic toxicity, and <1400 μg/L free of toxicity; the category is determined by signs and symptoms in the patient.

Is 200 mcg of selenium safe?

Selenium is suggested in doses of no more than 200 mcg per day. The treatment range for selenium is narrow. You shouldn’t take too much. The recommended dose is 100 mcg to 200 mcg per day.

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How do I know if my horse is getting enough selenium?


The more severe the deficiency and the more intense the horse’s training, the more noticeable the symptoms. Common symptoms include: Stiff gait. Sore, painful muscles.

What are the signs of selenium deficiency in horses?

Deficiency in selenium can cause a variety of symptoms in horses, including myopathy (muscle disease), impaired movement, difficulty in suckling and swallowing, respiratory distress and impaired heart function.

What are the signs of too much selenium?

Getting too much selenium over time can cause the following:

  • Garlic breath.
  • Nausea.
  • Diarrhea.
  • Skin rashes.
  • Irritability.
  • Metallic taste in the mouth.
  • Brittle hair or nails.
  • Loss of hair or nails.

Is it safe to take selenium everyday?

When taken by mouth: Selenium is LIKELY SAFE for most people when taken by mouth in doses less than 400 mcg daily, short-term. However, selenium is POSSIBLY UNSAFE when taken by mouth in high doses or for a long time. Taking doses above 400 mcg can increase the risk of developing selenium toxicity.

What are the signs of selenium toxicity?

Impacts of Selenium Overexposure

Selenosis symptoms include fatigue and hair and nail damage or loss. Neurotoxic effects can include lethargy, dizziness, motor weakness and burning or prickling in the extremities. There is some evidence for chronic impacts at lower doses including heart disease.

What blocks selenium absorption?

Smoke cigarettes. Drink alcohol. Take birth control pills. Have a condition that prevents your body from absorbing enough selenium, such as Crohn disease or ulcerative colitis.

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Does selenium help with brain fog?

Many proteins that carry out functions throughout our bodies need selenium to work. Selenium deficiency can cause nonspecific symptoms like fatigue and brain fog. But it also causes serious issues like infertility and may even amplify the effect of certain viruses if you get infected.

What is the best form of selenium to take?

What is the best form of selenium supplements? Selenium is available as selenomethionine, selenocysteine, selenite, and selenate (1). Selenomethionine and selenocysteine are better absorbed by the gut (11).

What are the symptoms of vitamin E deficiency in horses?

Symptoms of Vitamin E Deficiency in Horses

  • Gait abnormalities.
  • Dry or damaged coat.
  • Muscle weakness or trembling.
  • Prolonged laying down.
  • Rapid heartrate.
  • General stiffness or lethargy.
  • Loss of muscle mass or condition.
  • Toe dragging.

How do you know if your horse needs magnesium?

Signs of Magnesium Deficiency

  1. Nervousness/Excitability/Anxiety.
  2. Unable to relax or focus.
  3. Muscle tremors, spasm, twitching, flinching skin, trembling.
  4. Muscle pain or cramps.
  5. Not tolerant of long periods of work.
  6. Highly sensitive to sound or movement.
  7. Hypersensitive skin.
  8. Irritable moods.

What causes high selenium levels in horses?

Selenium toxicosis in horses occurs when a horse&rsquo;s diet has been over-supplemented with vitamins and minerals. Selenium, a mineral that protects cells from damage, can be toxic to horses if given too much in their diet. Those horses suffering from chronic selenium toxicity are diagnosed with alkali disease.