Pyridoxine (also known as vitamin B6, one form of which is pyridoxal-5-phosphate – PLP)

Pyridoxine in SPECTRUM NEEDS

pyridoxine moleculePyridoxine is added in order to provide a wide basis of nutrition, especially given the important role of pyridoxine in energy metabolism and the preliminary data regarding its use as a food supplement in ASD. It is unclear whether the inactivated or activated (PLP) form of pyridoxine is preferred, and thus the SPECTRUM NEEDS product contains both forms in equal amounts. Side effects are unexpected.

The Details

What Is Pyridoxine? Pyridoxine, also known as vitamin B6, is one of the eight B-complex vitamins. Pyridoxine cannot be manufactured by humans and is thus a true vitamin, obtained exclusively from the diet.

What Does Pyridoxine Do? The active form of pyridoxine, pyridoxal 5-phosphate (PLP), serves as an enzyme cofactor in over 100 enzyme reactions in carbohydrate, lipid, and amino acid metabolism. PLP is also involved in neurotransmitter, myelin, hemoglobin synthesis, and gene expression.

What Does a Pyridoxine Deficiency Appear as? Deficiency is generally found in individuals with highly-restricted diets and/or substantial gastrointestinal disease. Symptoms can include weakness, fatigue, depression, seizures, peripheral neuropathy, vomiting, anemia, and cardiovascular disease including stroke.

What About Pyridoxines Use in Autistic Spectrum Disorders (ASD)? The role of pyridoxine in the treatment of autism is not well studied. Children with ASD often have diets that are relatively deficient in many nutrients. One study (https://www.ncbi.nlm.nih.gov/pubmed/16494569), revealed that pyridoxine levels are high and PLP (activated pyridoxine) levels are low in children with ASD, suggesting a defect in pyridoxine activation, and arguing for PLP supplementation in ASD. In another study, pyridoxine supplementation, with riboflavin and magnesium, lowered dicarboxylic acid levels in children with ASD, which suggests that the treatment improved fatty acid metabolism https://www.ncbi.nlm.nih.gov/pubmed/21840465. A review article reported positive results in children with ASD treated with high dose pyridoxine combined with magnesium (https://www.ncbi.nlm.nih.gov/pubmed/1828703). Pyridoxamine 5′-phosphate oxidase deficiency, a metabolic condition caused by loss of the enzyme function that actives pyridoxine, results in severe encephalopathy (brain disease). Some cases have had ASD, and disease improves with PLP therapy. Also see: https://www.ncbi.nlm.nih.gov/pubmed/27330305.

What About Pyridoxines Use in Other Conditions? Pyridoxine is sometimes recommended for Alzheimer disease, attention deficit-hyperactivity disorder (ADHD), Down syndrome, diabetes and related nerve pain, sickle cell anemia, migraine headaches, asthma, carpal tunnel syndrome, night leg cramps, muscle cramps, arthritis, allergies, acne and various other skin conditions, and infertility. It is also used for dizziness, motion sickness, preventing the eye disease age-related macular degeneration, seizures, convulsions due to fever, and movement disorders (tardive dyskinesia, hyperkinesis, chorea). Some people use pyridoxine for boosting the immune system, eye infections, bladder infections, preventing cancer and kidney stones, increasing appetite, and helping people remember dreams.

What Form of Pyridoxine is Best? Most supplements contain inactivated pyridoxine, but some sources suggest that the activated (pyridoxal-5-phosphate, abbreviated as PLP) form is better. Studies are few, and the answer is not clear.

What Are the Common and/or Important Side Effects of Pyridoxine? Pyridoxine is a water-soluble vitamin and thus considered to be generally non-toxic. Side effects are rare at usual doses used in supplementation.

Is There Any Laboratory Testing for Pyridoxine Deficiency? Laboratory testing can reveal the presence of a deficiency of this nutrient, but is generally not likely to have clinically utility.

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