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Dimethyl sulfoxide — a carrier solvent that can transport other substances through the skin. Used cautiously by some in the iodine community.
DMSO (dimethyl sulfoxide) is a naturally occurring compound derived from wood pulp. It has the unique ability to penetrate cell membranes rapidly, passing through the skin and into deeper tissue within minutes. This property makes it unlike almost any other substance — it acts as a carrier molecule, transporting dissolved compounds along with it.
First discovered in the late 1800s as an industrial solvent, DMSO gained medical attention in the 1960s when researchers noticed it could deliver medications through the skin without needles. Some people in the iodine community use DMSO to enhance transdermal iodine absorption, helping iodine penetrate deeper than it would on its own.
When iodine is applied to the skin alone, absorption is limited to the upper layers. DMSO changes this by opening pathways through cell membranes, allowing iodine to reach deeper tissue and enter the bloodstream more effectively.
The combination is particularly useful for people who have trouble absorbing oral iodine, or for targeting specific areas of the body. Some apply DMSO mixed with SSKI or Lugol's to the skin over the thyroid, breasts, or other areas where iodine is needed.
Clean the skin thoroughly
Wash the application area with plain water — no soap residue, lotions, or chemicals. DMSO will carry anything on the skin into the body.
Mix DMSO with iodine
A common ratio is 1 part iodine to 1 part DMSO, though some use less DMSO. Start with a small area to test sensitivity.
Apply and let absorb
Spread the mixture on clean skin. A warming or tingling sensation is normal. Allow it to absorb fully before covering with clothing.
Note the garlic effect
Within minutes, most people taste garlic or experience a garlic-like smell on the breath. This is a well-known DMSO side effect and is harmless — it comes from the body metabolizing the sulfoxide compound.
Almost everyone who uses DMSO notices a garlic-like taste in the mouth within 15-30 minutes of application, even though no garlic was consumed. This happens because the body metabolizes DMSO into dimethyl sulfide, a sulfur compound that is exhaled through the lungs and can also come through the pores.
The taste and smell are harmless but can be socially awkward. They typically last several hours and are more pronounced with larger applications. This is the most common reason people limit how often they use DMSO.
This distinction is critical. DMSO is widely available as an industrial solvent, but industrial-grade DMSO may contain impurities that would be carried directly into the body. Only pharmaceutical-grade (99.9%+ purity) DMSO should ever be used on the skin.
Because DMSO carries substances through the skin, anything on the skin's surface can be transported into the body — including contaminants, lotions, fragrances, or cleaning product residue. The skin must be completely clean before application.
DMSO should be stored in glass, not plastic, as it can dissolve or leach compounds from many plastics. Latex gloves should not be used when handling it for the same reason — nitrile gloves are a safer choice.
DMSO is not part of the standard iodine protocol. It is used by some experienced practitioners for specific purposes. Those new to iodine should focus on the core protocol and supporting nutrients first. DMSO can be explored later once the basics are well established and the body is responding well.
The core protocol covers what most people need.