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Involved in over 300 enzymatic reactions. One of the most commonly deficient minerals — and a critical part of the protocol.
Magnesium is required for ATP (energy) production in every cell. It supports thyroid hormone function, helps muscles relax, calms the nervous system, and supports sleep. When magnesium is low, everything from energy to mood to muscle function suffers.
The iodine protocol recommends 200-400mg daily, adjusted for body weight and activity level. A 4:1 magnesium-to-calcium ratio using chelated forms is recommended for optimal balance.
Magnesium is involved in over 300 enzymatic reactions in the body — from DNA synthesis to protein production to blood sugar regulation. It is not an exaggeration to say that almost nothing in the body works properly without adequate magnesium.
“Iodine is a switch. A powerful one. It tells our cells to wake up, rebuild, detox, and get back to work. But without the parts, tools, and energy to do that work? We crash.”
Modern farming practices have depleted magnesium from soil, meaning even whole foods contain less magnesium than they did decades ago. Processed foods are stripped of magnesium during refining. Stress, caffeine, alcohol, and certain medications all increase magnesium excretion.
Estimates suggest that 50-80% of the population is deficient in magnesium. Standard blood tests only measure serum magnesium, which represents less than 1% of total body stores — so many people test "normal" while being deeply deficient at the cellular level. An RBC (red blood cell) magnesium test is far more accurate.
Deficiency symptoms are so common that most of us have normalized them: muscle tension, poor sleep, anxiety, constipation, headaches, and fatigue. These are not just "part of life" — they are the body asking for magnesium.
Stress depletes magnesium, and low magnesium makes us less resilient to stress. This vicious cycle means that the people who need magnesium most are burning through it fastest. Breaking this cycle is one of the most impactful changes we can make.
Not all magnesium is created equal. Different forms have different absorption rates and different effects in the body. Choosing the right form depends on what we are trying to address.
Calming, highly absorbable. Best for sleep, anxiety, and overall repletion. Least likely to cause digestive upset. The go-to form for most people.
Good absorption, natural laxative effect. Helpful for those with constipation. May be too loosening for some at higher doses.
Excellent for energy production and muscle pain. Supports ATP production directly. Good daytime magnesium.
Lower absorption rate but higher elemental magnesium per dose. Gentle option for gradual repletion. Very affordable.
Crosses the blood-brain barrier. Used for cognitive support, memory, and brain fog. More expensive but unique in its benefits.
Bypasses the digestive system entirely. Great for those with GI sensitivity. Epsom salt baths are deeply relaxing.
Not everyone tolerates oral magnesium well, especially at first. The digestive system can only absorb so much at once, and excess causes loose stools. Topical magnesium bypasses this entirely and delivers magnesium directly through the skin.
Epsom salt (magnesium sulfate) baths are a community favorite — 1-2 cups in a warm bath for 20-30 minutes. The magnesium absorbs through the skin while the sulfate supports liver detox pathways. Many people find this deeply relaxing and report better sleep on bath nights.
Magnesium oil (magnesium chloride in water) can be sprayed directly on the skin. It may tingle or itch at first — this often indicates deficiency and tends to decrease as levels improve. Applying to the feet or legs before bed is a common approach.
Epsom Salt Bath
Add 1-2 cups of Epsom salt to a warm bath. Soak for 20-30 minutes. Great for relaxation, muscle soreness, and sleep preparation.
Magnesium Oil Spray
Spray onto arms, legs, or feet. Allow to absorb for 20 minutes before rinsing if desired. May tingle on first use.
Magnesium Lotion
A gentler alternative to mag oil. Does not tingle. Good for those with sensitive skin or for use on children.
Foot Soak
For those who do not have a bathtub: dissolve 1/2 cup Epsom salt in a basin of warm water and soak feet for 20 minutes.
While supplementation is often necessary to correct deficiency, food sources of magnesium should be part of the long-term strategy. The body absorbs magnesium from food alongside cofactors that enhance its utilization.
Start low and increase gradually to avoid loose stools. Split doses into 2-3 servings throughout the day for better absorption. Many people take their main dose in the evening for sleep support. Glycinate form is the go-to for most people on the protocol.
Combining oral supplementation with topical methods is a great strategy for faster repletion. Taking magnesium with food generally improves absorption and reduces digestive side effects.
Those with kidney disease should consult a doctor before supplementing magnesium. The kidneys regulate magnesium levels, and impaired function can lead to accumulation.
“It’s like flipping the breaker to a building that hasn’t had power in years. If the wiring’s not solid, things might spark, sputter, or blow a fuse.”
Magnesium is one of six key components in the iodine protocol.