Magnesium Stearate

Magnesium Stearate

Why do so Many Companies add it to Their Supplements?

The primary role of magnesium stearate in supplements is to act as a lubricant to prevent tablet and capsule contents from sticking to the machinery that processes them. This ensures that production machinery can operate at maximum speeds and profit targets can be met. In other words, it is primarily used for financial reasons.

Read a detailed explanation of magnesium stearate’s role as a lubricant in manufacturing facilities.

What are the Pros and Cons of Magnesium Stearate?


The pros are for manufacturers that want to improve profit margins. It is far more costly and time-intensive to produce supplements without magnesium stearate.

Reduction of dissolution time

Brand X With Stearates - Will Not Dissolve
Brand X With Stearates
- Will Not Dissolve

Dr. Ron’s Dissolves Easily
Dr. Ron’s Dissolves Easily

It is commonly noted in medical literature that magnesium stearate increases the time it takes for tablets and capsules to dissolve due to the film it forms on capsule or tablet ingredients. Magnesium stearate coats a good portion of the molecules in a tablet or capsule, requiring digestive enzymes to break down the magnesium stearate coating before being able to access the nutrients it envelops.

In a study published in the journal Pharmaceutical Technology (April, 1985), the percent dissolution for capsules after 20 minutes in solution went from 90% without stearates to 25% with stearates. In other words, stearates reduced the rate the capsule dissolved by 65%! This may result in the nutrients not dissolving in the appropriate section of the intestines as intended. We are particularly concerned about individuals with impaired digestion who may have more difficulty absorbing nutrients coated with magnesium stearate.

Are There Metal Catalysts in Your Supplement?

Hydrogenated oils are a common source for the magnesium stearate used in pharmaceuticals and supplements. The stearates are made by hydrogenating cottonseed or palm oil. Cottonseed oil has the highest content of pesticide residues of all commercial oils; cotton crops are heavily sprayed. In the hydrogenation process, the oil is subjected to high heat and pressure in the presence of a metal catalyst for several hours, creating a hydrogenated saturated fat. Hydrogenated vegetable fats contain altered molecules derived from fatty acids. According to Udo Erasmus in Fats and Oils, the metal catalyst used in the hydrogenation process may also contaminate the stearates produced.

Is your supplement contaminated?

Are your supplements contaminated?

In December 2011 The World Health Organization reported that several batches of magnesium stearate were cross-contaminated with zeolite (sodium aluminium silicate), calcium hydroxide, dibenzoylmethane, bisphenol A and Irganox 1010. While some of these substances may not be harmful, as is the case with zeolite, others are known to be harmful, such as bisphenol A (BPA). The industrial chemical BPA is an endocrine disruptor and has been found to have other harmful effects. The European Union has banned its use in baby bottles and several consumer groups in the U.S. have petitioned the FDA to ban its use in food containers. But whether or not the contaminants found in the magnesium stearate are benign or harmful is not the issue. The issue is that it was contaminated at all.

While we don’t know the percentage of supplements in the U.S. that are contaminated, according to a New York Times article “Nearly all of the herbal dietary supplements tested in a Congressional investigation contained trace amounts of lead and other contaminants…” There have also been news stories over the years about contaminated supplements, such as heavy metals in 20 percent of Ayurvedic herbal products tested in the Boston area in 2004. Clearly, contamination is an issue of concern.

Do You Know What You’re Putting into Your Mouth?

While magnesium stearate is certainly not the only supplement ingredient ever found to be contaminated, the potential for contamination is just one more reason to avoid it. If you do wish to consume supplements containing magnesium stearate, it would be a good idea to ask the manufacturer if they batch-test the supplement for purity. If not, then you really don’t know what you are putting into your mouth.

While we believe that contamination is a concern, we do not support stricter government regulations on dietary supplements due to contamination issues. These issues could be much better addressed in the way that we here at Dr. Ron’s Ultra-Pure address it: batch testing.
Although we have a great deal of trust in our ingredient suppliers, which are mainly in the U.S., Europe and New Zealand, we nonetheless have the raw materials that go into our supplements independently analyzed. Our certificates of analysis demonstrate the purity of our products. Here are a few sample assays:

Alpha LipoPotasic Acid: Assay: 99.72%; Loss on Drying: 0.25%. Purity thus tested at 99.97%.
Glucosamine Sulfate Potassium: Assay: 99.88%; Loss on Drying: 0.072%. Purity thus tested at 99.952%.

Why Buy Dr. Ron’s Ultra-Pure Additive-Free Supplements?

Grassfed New Zealand cattle are the primary source of Dr. Ron's Ultra-Pure organs and glands

  • Grassfed New Zealand livestock are the only source of Dr. Ron's Ultra-Pure organs and glands.
  • What is on the label is what you get.
  • Raw materials are independently analyzed for purity
  • Quality, quality and quality!
  • Dr. Ron has formulated our supplements since 2000 based on his experience treating patients as a naturopathic doctor since 1981
  • Many of our supplements are based on Dr. Weston Price’s studies of the foods that made robustly healthy native peoples disease-resistant, including our organs and glands, cod liver oil and ghee.

Remember, the sole purpose of using magnesium stearate is to make the machines go faster. Supplements can be made without them – it just takes more time, care and attention to detail. Our exclusive process yields absolutely pure supplements – no lubricants, binders, flowing agents, fillers, dyes or additives of any kind – only the pure nutrients.