Food-Grade Diatomaceous Earth: What's It Used For?

Food-grade diatomaceous earth has become popular as a supplement that supports digestive, bone, and heart health. What does science say about it?
Food-Grade Diatomaceous Earth: What's It Used For?

Last update: 25 August, 2022

Diatomaceous earth is a powder obtained from the cell walls of microscopic skeletons of algae or aquatic organisms. There’s industrial-grade, and also food-grade diatomaceous earth.

The latter is distributed as a dietary supplement, as it’s believed to help eliminate toxins, heavy metals, and other waste from the body. In addition, it’s linked to better bone and cardiovascular health. Is there any evidence for these benefits, and is it safe to consume? In the following article, we’ll tell you everything you need to know about it.

Food-grade diatomaceous earth

Food-grade diatomaceous earth contains between 0.5% and 2% crystalline silica. This is the characteristic that differentiates it from industrial grade diatomaceous earth, which is composed of more than 60% crystalline silica, an amount that is toxic to humans and animals.

As explained in a review shared in The Journal of Nutrition, Health and Aging, silica is used as a food additive, and specifically as an anti-caking agent. In beverages and products, it allows clarification and viscosity control. It’s also an excipient used in the manufacture of pharmaceuticals and vitamins.

Diatomaceous earth for food use is approved by the Food and Drug Administration (FDA) and the United States Department of Agriculture (USDA).

Currently, this ingredient is available in powder and pressurized liquid form, and used in farms, gardens, buildings, and human and pet food. To be more precise, it’s possible to find the following formats of the product:

  • Granulated: Available in powder form, suitable for human consumption, as it has less than 1% crystalline silica.
  • Ground or micronized: This is the form usually used in insecticides.
  • Calcined: Obtained by heat treatment. It’s used for filtering liquids and explosives. This is the industrial use variety.
Silica gel.
Silica is part of many everyday products, but its high concentration is toxic for human consumption.

What is food-grade diatomaceous earth used for? Potential benefits

Silica – the main active compound in diatomaceous earth – is a key component of human ligaments, cartilage, and muscles. It also plays an important role in plant growth and development.

In addition to this, it is effective as an insecticide. As detailed in research reported in the Asian Pacific Journal of Tropical Biomedicine, the silica in this ingredient causes dehydration of the insect, which facilitates its extermination.

However, as a food supplement, diatomaceous earth is said to provide several health benefits. However, many of these applications come from anecdotal evidence, as no quality clinical trials have been carried out to corroborate its purported effects. So, what would these uses be?

Effects on detoxification of the body

One of the most popular benefits of food-grade diatomaceous earth has to do with detoxification of the body. According to proponents, this supplement can cleanse the digestive tract, optimize liver function, and stimulate the elimination of toxins.

Despite these claims, there’s no conclusive research on the subject. While industrial diatomaceous earth has been found to help remove heavy metals from water, there’s no evidence that the same is true for food-grade diatomaceous earth.

Only one small study in The American Journal of Clinical Nutrition reported that silica may contribute to the removal of heavy metals such as aluminum and, in the process, limit their availability in the gastrointestinal tract. More evidence is needed however.

Effects on bone health

Promoters of diatomaceous earth claim that it’s a good supplement to take care of bone and joint health. They argue this on the silica content, which is a beneficial mineral for bones and connective tissue.

A study shared in The Journal of Nutrition, Health and Aging details that the unoxidized form of silica protects bone health and helps prevent bone density loss. However, the silica in diatomaceous earth isn’t well absorbed, so it’s unlikely to have this benefit.

Effects on cholesterol levels

In a small study reported in the European Journal of Medical Research, participants were supplemented with diatomaceous earth in order to lower cholesterol levels. They took 250 mg of the product, 3 times a day, for 8 weeks.

After this time, the researchers observed benefits. To be more precise, a 13.2% decrease in bad cholesterol or LDL and triglycerides was found. In addition, it was also associated with an increase in good cholesterol or HDL.

Given the age of the study, and the low number of participants, more evidence is required before affirming these effects.
Blood cells.
The possibility that this substance reduces cholesterol exists, but there are no major scientific studies to corroborate it.

Other possible effects of food-grade diatomaceous earth

As a dietary supplement, diatomaceous earth is associated with other possible health effects. However, these are theoretical claims, as they aren’t yet supported by scientific evidence.

Such benefits include the following:

Formats and dosages of diatomaceous earth

Diatomaceous earth may be included in dietary supplements and medication. It’s also present in skin care and pet nutrition products. It may be found in some kinds of toothpaste, scrubs, foods, and beverages.

Dosage tends to vary. Generally, it ranges from 1.5 to 3 grams per day.

In any case, it’s best to consult the manufacturer’s instructions. Whenever possible, these supplements should be taken under medical supervision.

Product safety and contraindications

Food-grade diatomaceous earth is generally safe. As long as it’s taken moderately, it doesn’t usually pose risks.

However, care should be taken not to inhale the dust. This is due to the risk of silicosis, an inflammation and scarring of the lungs that occurs when inhaling crystalline silica.

Due to the lack of research, this product shouldn’t be used by pregnant or breastfeeding women. Nor should it be used in children or patients with chronic diseases.

What to remember?

Food-grade diatomaceous earth has been linked to beneficial effects on the body, such as detoxification and lowering cholesterol. However, there are no conclusive studies on this subject.

Therefore, these supplements should be used with caution. Under no circumstances should they replace medical treatment.

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