California Proposition 65

Soylent & California’s Proposition 65

At Soylent, our top priority is for the health and well-being of our customers. A recent quality assurance analysis conducted by an independent, third-party lab showed that the heavy metal content in the brown rice protein used in Soylent was above levels indicated in previous testing.

These levels are in no way toxic, and Soylent remains completely safe and nutritious. Soylent is not in violation of any product-safety standards or requirements, and is manufactured in FDA-approved facilities that follow federally regulated current Good Manufacturing Practices (cGMP). No changes to our formula are mandated by law, and we stand by the quality and safety of our product. 

About Proposition 65

Proposition 65 is a California law enacted in 1986. Fundamentally, the law requires that a warning be provided in situations where someone could be exposed to one of more than 800 listed chemicals or heavy metals above a limit established by the law. A Proposition 65 warning does not mean a product is in violation of any product-safety standards or requirements, or that the “exposure” from the product exceeds established levels. Soylent contains heavy metals that are included on the Proposition 65 list, so the following warning must be provided:

WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

This warning is triggered by extremely low levels of the regulated compounds, and as such, the notification is a familiar sight to anyone who has eaten at a restaurant, stayed in a hotel, attended a theme park, or parked in a parking garage in California.

Proposition 65 & Traditional Foodstuffs

Trace amounts of heavy metals are present in nearly all types of food.  In 2014, the Food and Drug Administration published a five-year study of heavy metals in grocery store items. To demonstrate the prevalence of daily heavy metal intake, we have included the following graphic based on that study:

Meal data can be found in this spreadsheet.

If you have questions, please do not hesitate to reach out to our Customer Care team at for more information.