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Why We Don't Use Stearates

There has been much controversy over use of stearates (a form of hydrogenated oil) in the production of nutritional supplements. Stearates, often labeled as magnesium stearate, steric acid, or calcium stearate, are hydrogenated fats --typically cottonseed or palm oil-- that are frequently used in factories as lubricants to help the encapsulating machinery run faster and prevent the ingredients from clumping within the capsule. Cottonseed oil has the highest content of pesticide residues of all commercial oils; cotton crops are heavily sprayed.

While these fats may make machines run better, they could ultimately clog up the ultimate machine—your body. Some studies indicate that stearates interfere with the absorption of nutrients in the body, sometimes reducing the absorption rate by more than 50%. In addition to hydrogenated oils being toxins, cottonseed oil has among the highest pesticide residue of any commercial oil. While the health risks of stearates are still being studied and debated, we feel that it’s important not to take any unnecessary chances with your health. We are proud to announce that D’Adamo Personalized Nutrition formulas are now 'stearate free.'

You Don't Need Bathtub Rings in Your Supplements

Magnesium stearate can be manufactured from both animal and vegetable oils. Some nutritional supplements specify that the magnesium stearate used is sourced from vegetables. Magnesium stearate is a major component of "bathtub rings." When produced by soap and hard water, magnesium stearate and calcium stearate both form a white solid insoluble in water, and are collectively known as "soap scum."

There has been evidence of the past that certains batches of stearates have been contaminated (1)

You Don't Need Human Hair or Duck Feathers As Well

To create a product that is safe and Right For All Types, leucine, an amino acid derived from vegetable sources, is used in manufacturing D’Adamo Personalized Nutrition products. Leucine is not produced by the human body, but is essential for important metabolic functions such as building protein. There are many companies who have transitioned from using stearates to leucine, however many forms of leucine are derived from human hair or duck feathers. A few companies, including D’Adamo Personalized Nutrition, are obtaining leucine from vegetable sources which involves farming microbal leucine. This process, conducted in Germany, is time consuming and expensive, however, we believe the microbially derived leucine is of superior quality and ultimately, better for the health of our discriminating consumer.

As always, we strive to provide the very highest quality supplements made with the safest, most effective ingredients.


  1. 'Contaminated magnesium stearate VG EP excipientm anufactured by Ferro, supplied by Signet and used in finished pharmaceutical products' World health Organization (WHO) [link]