Histamine is a substance that is produced by the body as part of an allergic reaction.

Useful for evaluating for diseases of immediate hypersensitivity or mast cell proliferation (mastocytosis). Histamine is one of the major mediators of allergic reactions. Some carcinoid tumors, particularly of gastric origin, produce and release excessive histamine. Symptoms of flushing, itching, urticaria, vomiting, syncope or shock assumed to be due to histamine release, which coincides with increased urine of plasma levels. Systemic mastocytosis or basophilia can produce persistent elevations in plasma or urine histamine concentrations.

Histidine is a semi-essential amino acid which is formed in the breakdown of carnosine. Red meat is a common source of carnosine, and therefore histadine. Other food sources include poultry, fish, nuts, seeds, and grains. Histidine and histamine have a unique relationship. The amino acid histadine becomes histamine via a vitamin B6- dependent enzyme called histidine decarboxylase. 

Histidine ameliorates fatigue, promotes clear thinking and concentration, reduces appetite, decreases anxiety, improves sleep and glucose homeostasis, and gives rise to histamine.

Histidine is a semi-essential amino acid which is formed in the breakdown of carnosine. Red meat is a common source of carnosine, and therefore histadine. Other food sources include poultry, fish, nuts, seeds, and grains. Histidine and histamine have a unique relationship. The amino acid histadine becomes histamine via a vitamin B6- dependent enzyme called histidine decarboxylase. 

Histidine is a semi-essential amino acid which is formed in the breakdown of carnosine. Red meat is a common source of carnosine, and therefore histadine. 

Other food sources include poultry, fish, nuts, seeds, and grains. Histidine and histamine have a unique relationship. The amino acid histadine becomes histamine via a vitamin B6- dependent enzyme called histidine decarboxylase. 

With this, decreased amounts of histidine and insufficient vitamin B6 can subsequently lead to a decrease in histamine concentration. This may impair digestion, since histamine binds to H2 receptors located on the surface of parietal cells to stimulate gastric acid secretion, necessary for protein breakdown.

Histidine also inhibits the production of proinflammatory cytokines by monocytes and is therefore anti-inflammatory and antioxidant. 

With these beneficial effects, histidine supplementation has been shown to improve insulin resistance, reduce BMI, suppress inflammation, and lower oxidative stress in obese women with metabolic syndrome. 

Interestingly, histadine can also be broken down to form urocanic acid in the liver and skin. Urocanic acid absorbs UV light and is thought to act as a natural sunscreen.

Histidine is a semi-essential amino acid which is formed in the breakdown of carnosine. Red meat is a common source of carnosine, and therefore histadine. 

Other food sources include poultry, fish, nuts, seeds, and grains. Histidine and histamine have a unique relationship. The amino acid histadine becomes histamine via a vitamin B6- dependent enzyme called histidine decarboxylase. 

With this, decreased amounts of histidine and insufficient vitamin B6 can subsequently lead to a decrease in histamine concentration. This may impair digestion, since histamine binds to H2 receptors located on the surface of parietal cells to stimulate gastric acid secretion, necessary for protein breakdown.

Histidine also inhibits the production of proinflammatory cytokines by monocytes and is therefore anti-inflammatory and antioxidant. 

With these beneficial effects, histidine supplementation has been shown to improve insulin resistance, reduce BMI, suppress inflammation, and lower oxidative stress in obese women with metabolic syndrome. 

Interestingly, histadine can also be broken down to form urocanic acid in the liver and skin. Urocanic acid absorbs UV light and is thought to act as a natural sunscreen.

Histidine is a semi-essential amino acid which is formed in the breakdown of carnosine. Red meat is a common source of carnosine, and therefore histadine. Other food sources include poultry, fish, nuts, seeds, and grains. Histidine and histamine have a unique relationship. The amino acid histadine becomes histamine via a vitamin B6- dependent enzyme called histidine decarboxylase. 

Histidine is a semi-essential amino acid which is formed in the breakdown of carnosine. Red meat is a common source of carnosine, and therefore histadine. Other food sources include poultry, fish, nuts, seeds, and grains. Histidine and histamine have a unique relationship. The amino acid histadine becomes histamine via a vitamin B6- dependent enzyme called histidine decarboxylase. 

Histidine is a semi-essential amino acid which is formed in the breakdown of carnosine. Red meat is a common source of carnosine, and therefore histadine. 

Other food sources include poultry, fish, nuts, seeds, and grains. Histidine and histamine have a unique relationship. The amino acid histadine becomes histamine via a vitamin B6- dependent enzyme called histidine decarboxylase. 

With this, decreased amounts of histidine and insufficient vitamin B6 can subsequently lead to a decrease in histamine concentration. This may impair digestion, since histamine binds to H2 receptors located on the surface of parietal cells to stimulate gastric acid secretion, necessary for protein breakdown.

Histidine also inhibits the production of proinflammatory cytokines by monocytes and is therefore anti-inflammatory and antioxidant. 

With these beneficial effects, histidine supplementation has been shown to improve insulin resistance, reduce BMI, suppress inflammation, and lower oxidative stress in obese women with metabolic syndrome. 

Interestingly, histadine can also be broken down to form urocanic acid in the liver and skin. Urocanic acid absorbs UV light and is thought to act as a natural sunscreen.

Histidine is a semi-essential amino acid which is formed in the breakdown of carnosine. Red meat is a common source of carnosine, and therefore histadine. Other food sources include poultry, fish, nuts, seeds, and grains. Histidine and histamine have a unique relationship. The amino acid histadine becomes histamine via a vitamin B6- dependent enzyme called histidine decarboxylase. 

Histidine is the amino acid most necessary during stress. Amino acids are the building blocks of protein in our bodies.

Histidine is involved in one-carbon units for conversion of formiminoglutamic acid (FIGLU) to glutamic acid.

- High plasma histidine has been associated with increased plasma glutamic acid, alanine and glutamine, and decreased branched-chain amino acids.

- Elevated urine histidine means it is not available for hemoglobin production. Hemoglobin is 10% histidine.

- High levels have been associated with progression of type 2 diabetes after gestational diabetes (= a type of diabetes that can develop during pregnancy in women who don't already have diabetes.)

- Decreased plasma histidine was associated with increased risk of ulcerative colitis relapse; a higher serum CRP in Crohn’s disease; chronic kidney disease; increased inflammation; and atopic dermatitis.

Histidine is the amino acid most necessary during stress. Amino acids are the building blocks of protein in our bodies.

Histidine ameliorates fatigue, promotes clear thinking and concentration, reduces appetite, decreases anxiety, improves sleep and glucose homeostasis, and gives rise to histamine.

This test distinguishes drug-induced lupus from other lupus variants and autoimmune conditions. Though not a definitive diagnostic tool, histone antibodies align with drug-induced lupus. It's often ordered alongside a positive ANA test and sometimes an anti-dsDNA test. Following drug-induced lupus diagnosis, discontinuing the drug is advised, with histone antibody tests for monitoring. These tests are ordered when an individual taking medication for weeks to years exhibits symptoms linked to drug-induced lupus, especially without prior autoimmune history. Symptoms include joint pain, fatigue, fever, myalgia, malar rash, sunlight sensitivity, and weight loss. CNS and kidney symptoms are rarer in drug-induced lupus compared to systemic lupus erythematosus (SLE). Post-drug discontinuation, the histone antibody test can track changes. A negative result suggests alternatives, yet drug-induced lupus is possible without histone antibodies.