Magnesium and Sulfur Supplement for Deficiency and Health

Unlocking the Power of Magnesium with Sulfur

Why your magnesium supplement is not working, and the missing mineral required to fix it.

Mound of fine white mineral powder, illustrating an article on magnesium and sulfur supplement for deficiency
Mound of fine white mineral powder. Used for illustration only — Tarsul is a dietary supplement, not a treatment for any condition.

The Limits of Isolated Magnesium

If you are researching mineral deficiencies, you already know that magnesium is involved in over 300 enzymatic reactions in the human body. You know it is critical for muscle relaxation, nerve function, and energy production. And you likely know that modern agriculture has severely depleted magnesium from our food supply.

But what most people do not know is that taking a magnesium supplement is only half the battle. Many people take high-quality magnesium glycinate or citrate for months, yet still suffer from eye twitches, anxiety, and restless legs. Why?

Cream of tartar and MSM sulfur powder, the two ingredients in Tarsul, in the context of dietary mineral intake
Tarsul is a fine white powder — potassium bitartrate (cream of tartar) combined with MSM sulfur — stirred into water rather than swallowed as a tablet.
Because magnesium cannot function in a vacuum. It requires a healthy, permeable cell membrane to enter the cell and do its job.

The Sulfur Connection

This is where organic sulfur becomes the critical missing link. Sulfur is the structural foundation of your cell membranes. When you are deficient in sulfur—which almost everyone eating a modern diet is—your cell walls become rigid, thick, and impermeable. They lose their flexibility and their ability to efficiently transport nutrients.

When you take magnesium but lack sulfur, that expensive magnesium bounces off the rigid cell walls and is excreted through your digestive tract. You are essentially taking a supplement to create expensive urine, while your cells remain starved for the mineral.

Tarsul 60-capsule, 600 gram and 150 gram bottles, the sizes referred to in this magnesium and sulfur supplement for deficienc
Tarsul is sold in a 150 gram bottle, a 600 gram bottle and a 60-capsule bottle. Dosing guidance is on the ingredients page.

The Synergistic Solution

To truly resolve a magnesium deficiency, you must first restore the structural integrity of your cells. Tarsul provides the highly bioavailable organic sulfur required to rebuild flexible, permeable cell membranes.

By taking Tarsul, you optimize the cellular environment, allowing the magnesium from your diet (or your existing supplements) to finally penetrate the cell wall and activate those 300+ enzymatic reactions. Stop treating the symptom of low magnesium and start fixing the biological mechanism that prevents its absorption.

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About this page — last reviewed September 2026

Published by Tarsul, a family-run dietary supplement company operating from San Diego, California since 2010. Written and reviewed in-house by Russ Guillemot, founder, drawing on fifteen years of direct correspondence with customers and wholesale accounts. We are not physicians and nothing here is a diagnosis or a course of treatment.

Where we reference published research we name the authors and the journal so you can look it up yourself. Where something is a common observation rather than a finding, we say so plainly. If a claim cannot be sourced, we leave it out.

Tarsul · 2307 Fenton Parkway #107-42, San Diego, CA 92108 · 619-500-4403 · info@tarsul.com

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.