SpectraCell Blog

Vitamin A: Functions and Benefits

Posted by SpectraCell Laboratories, Inc. on Mon, Jul 31, 2017 @ 11:30 AM

vit A.jpgVitamin A was one of the earliest vitamins to be discovered – hence its top rank in the alphabetical vitamin nomenclature.Vitamin A is a family of fat soluble compounds that play an important role in vision, bone growth, reproduction, and immune system regulation. Most people associate vitamin A with carrots, and for good reason: the common orange veggie has high amounts of beta-carotene, which is actually a vitamin A precursor and also the reason carrots got their name. But vitamin A is actually a group of chemicals that are similar in structure, and include retinol (the most biologically active form of vitamin A), retinal, and retinoic acid.

β-carotene is slightly different in that it is cleaved in the intestinal mucosa by an enzyme to form retinol. Other carotenoids include lycopene and lutein but, although similar to vitamin A, they are not actually vitamin A in the truest sense. One distinction is that excessive amounts of vitamin A from over-supplementation, can cause toxicity (although deficiency is much more common). On the other hand, β-carotene does not cause vitamin A toxicity because there exists a regulatory mechanism that limits vitamin A production from beta carotene when high levels are ingested.

A large number of physiological systems may be affected by vitamin A deficiency which is most often associated with strict dietary restrictions and excess alcohol intake. Patients with Celiac disease, Crohn’s disease and pancreatic disorders are particularly susceptible due to malabsorption.  Vitamin A is also essential for the developing skeletal system and deficiency can result in growth retardation or abnormal bone formation. 

The functions of vitamin A are very diverse:

  • Eyesight: Vitamin A forms retinal, which combines with a protein (rhodopsin) to create the light-absorbing cells in the eye. This explains why a common clinical manifestation of deficiency is night blindness and poor vision.
  • Skin: In addition to promoting healthy skin function and integrity, vitamin A regulates the growth of epithelial surfaces in the eyes and respiratory, intestinal, and urinary tracts. Deficiency impairs epithelial regeneration, which can manifest as skin hyperkeratization, infertility, or increased susceptibility to respiratory infections.
  • Anemia: Vitamin A helps transfer iron to red blood cells for incorporation into hemoglobin; thus, a vitamin A deficiency will exacerbate an iron deficiency.
  • Weight management: Vitamin A reduces the size of fat cells, regulates the genetic expression of leptin (a hormone that suppresses appetite), and enhances the expression of genes that reduce a person’s tendency to store food as fat.
  • Cancer prevention: Vitamin A deficiency impairs the body’s ability to launch cell-mediated immune responses to cancer cells. Vitamin A inhibits squamous metaplasia (a type of skin cancer) and inhibits breast cancer cell growth.
  • Fertility: Vitamin A plays a key role in the synthesis of sperm.
  • Autism: Vitamin A is part of the retinoid receptor protein (G-alpha protein), which is critical for language processing, attention, and sensory perception. Some autistics have a defect in this protein that vitamin A supplementation can modulate.
  • Sleep: Vitamin A deficiency alters brains waves in non-REM sleep, causing sleep to be less restorative.

Vitamin A also interacts with other micronutrients. For example, zinc is required to transport vitamin A into tissues, so a zinc deficiency will limit retinal binding protein (RBP) synthesis and thus limits the body’s ability to use vitamin A stores in the liver. Oleic acid, a fatty acid found in olive oil, facilitates the absorption of vitamin A in the gut.

Find out if you have a vitamin A deficiency, and take steps to correct it, by ordering a micronutrient test today. 

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Topics: micronutrients, Vitamin A, Vitamins, Fertility, Cancer Prevention, Celiac Disease, Supernutrients, Weight Management, Vitamin A Deficiency, Chron's Disease, Anemia, Nutrients, β-carotene

NUTRIENT OF THE MONTH - Lipoic Acid

Posted by SpectraCell Laboratories, Inc. on Fri, Jan 20, 2017 @ 02:56 PM

broccoli.jpgWhen it comes to micronutrient name recognition, vitamins and minerals typically get the spotlight (think vitamin C, vitamin D, Magnesium). Less well known are antioxidants, the superstars when it comes to protection from oxidative stress and free radicals. Lipoic acid (AKA thioctic acid) is one such nutrient. This particular substance is unique in that it has antioxidant properties in both water and lipids (most antioxidants protect only one, but not the other). Its unique chemical structure makes it soluble in both, which is a physiologically important attribute. Fat-soluble nutrients protect cell membranes (which are made of fats), and water-soluble nutrients protect intracellular fluid. 

Another biologically important feature is its ability to regenerate (and therefore activate) other antioxidants such as vitamin C, vitamin E, glutathione, cysteine and coenzyme Q10 when they have been “used up.” It can bind to insulin receptors, and consequently enhances glucose uptake into muscles, making it useful in improving glucose tolerance in persons with Type 2 Diabetes. Lipoic Acid can also be effective in the treatment of certain diabetic complications such as peripheral neuropathy. Given its ability to protect against damage to fat-soluble cell structures (lipid peroxidation), it’s not surprising that this antioxidant may also help protect against the neuron injury often seen in Alzheimer’s patients. This powerful micronutrient’s impressive list of roles at the cellular level provides clear justification for its designation as a “supernutrient,” making it an effective therapy in a variety of conditions from cataracts to erectile dysfunction.

Interested in knowing how your antioxidant levels stack up? Get tested today!

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Topics: Alpha-Lipoic Acid, Antioxidants, Lipoic Acid, antioxidant status, Supernutrients