Non-occupational sources of sodium metabisulfite

Cosmetics (hair colours and bleaches, skin fading/lighteners, false tan lotions, antiageing creams and moisturizers, facial cleansers, around-eye creams, body washes/cleansers, hair sprays, perfumes, blush, bronzers/highlighters).

Swimming pool water

Food preservatives/additatives (avoid everything in the 220's)

• E 220 = sulfur dioxides = May cause allergic reactions in asthmatics, destroys vitamin B1, typical products are beer, soft drinks, dried fruit, juices, cordials, wine, vinegar, potato products
• E 221 = sodium suflite
• E 222 = sodium bisulfite
• E 223 = sodium metabisulfite
• E 224 = potassium metabisulfite
• E 225 = potassium sulfite
• E 226 = calcium sulfite
• E 227 = calcium hydrogen suflite
• E 228 = potassium bisulfite (SOURCE)

Source:
Madan, Vishal et al., Contact Dermatitis, 2007: 57: 173-176.

Occupational sources and uses of sodium metabisulfite

Industry = Use

Food and drink = Preservation and sterilization, refining sugar

Brewing, wine making = Sterilization in fermentation processes

Photographic chemicals = Formulation of developers and fixers

Dye houses/laundries = Color stripper and anti-chlor

Leather = Tanning (acidifying agent), solubilizing agent for tannins, reducing chrome liquors

Mineral extraction = Ore floatation aid

Effluent treatment = To reduce chromium salts

Chemical manufacture = In the manufacture of sulfosuccinates and sodium formaldehyde bisulfite

Rubber manufacture = Latex anticoagulant

Parenteral solutions = Prevent oxidation of adrenaline

Source:
Madan, Vishal et al., Contact Detmatitis, 2007: 57: 173-176.

Sulfite Oxidation - How the body processes sulfites

In my quest to understand sulfite sensitivities, I decided to find out what happens when a person ingests sulfites. What does the body do? Surprisingly, this was not a simple task for me so fair warning, this post will be very technical. I have made every attempt to diffuse the science into understandable everyday speak, if you would like to see the literature in its full scientific glory please follow the source links or email me for a copy of the journal article. Now on to the good stuff...

According to Parcell, compounds containing sulfur are found in all body cells and are indispensable for life. Sulfur is the sixth most abundant macromineral in breast milk and the third most abundant mineral determined by percentage of total body weight in adults. The term "thiol" refers to compounds containing sulfur. Sulfur is not normally added to the diet as a supplement because it occurs naturally in the following amino acids:

• Methionine
  
• Cysteine
  
• Cystine
  
• Homocysteine
  
• Homocystine
  
• Taurine

When sulfur is ingested it is converted to sulfate and excreted through urine or reused by the body. In plants and bacteria this process is called biosynthesis and in humans it is called oxidation.

So what's the difference between the the suffixes - ide, ate, ite?

• Ide is the ending used by binary compounds. The metal name goes first, then the nonmetal followed by ide. Sulf+ide = sulfide.


• Ate means with oxygen. Sulf+ate = sulfate.
  
• Ite means means less oxygen. Sulf+ite = sulfite.

Which brings us to sulfite oxidase, how the body processes sulfites.

According to Changjian et al, molybdenum (Mo) is the only second transition metal that has known biological functions in all forms of life; over 50 molybdoenzymes are known to catalyze oxidation-reduction reactions that are essential in the metabolism of carbon, nitrogen and sulfur. For animals there are two molybdoenzymes in sulfite oxidase family: Animal Sulfite Oxidase (a mitochondrial enzyme) and A. thaliana Sulfite Oxidase.

So when a person ingests sulfites, the sulfites are oxidized to sulfates at the molybdenum center and the reduced equilivants (sulfates and the reduced enzyme) are excreted through urine or reused by the body. This explains why a person with a sulfite sensitivity may benefit from taking a molybdenum supplement - having more molybdenum in their system means it is available to help in the oxidase of sulfites.

Additional sources:

Feng, Changjin, Gordon Tollin, John Enemark. Biochim Biophys Acta 2007; 1774(5): 527-539.

Parcell, Stephen. Alternative Medicine Review 2002; 7(1): 22-24.

Vitamin Supplements

My husband takes the vitamin supplements below on a daily basis:

Vitamin D3, D-1000 IU, made by Natures Bounty
Vitamin B-12, 1000 MCG, made by Natures Bounty
Folic Acid, 800 MCG, made by Sundown
Molybdenum, (also known as Moly-B), 250 MCG, made by Carlson

Even if you believe you have a healthy balanced diet it is important that you consult a medical professional to determine if you have a mineral, amino acid, enzyme or vitamin deficiency. These test will also provide you with a measure of your body's total antioxidant function. Not all conventional doctors will perform the more comprehensive tests as some of the tests are quite complex and expensive, making insurance coverage more difficult to receive. However, a quick google search of homeopathic medical provides should point you in the right direction.

For those of you living in Indianapolis, IN I went to Linda J. Spencer, FNP as a new patient, requested all of the diagnostic tests and she did not question my motives or try to sell me supplements. My insurance even paid for the testing (which was expensive) and the portion that I was responsible for was reasonable. My General Practioner doctor had been prescribing me ointment for eczema on my foot for years and it was Dr. Spencer who diagnosed mild food allergies as the cause. Now that I have eliminated those foods from my diet my eczema is clearing up.