Oyster (Zn)

Due to the natural presence of heavy metals in oysters, all Oyster (Zn) bottles include a Proposition 65 warning in compliance with California heavy metal testing regulations.

Over the course of six months, we tested oyster samples from seven countries worldwide and selected the source that offered the highest micronutrient content with the lowest detectable levels of heavy metals. While we are extremely selective with our sourcing, the reality is that no oyster product—whether fresh, canned, freeze-dried, or otherwise—can fully meet the strict thresholds established by Prop 65.

To provide full transparency, we make third-party testing results available for every product. These can be accessed directly on the product page by clicking the “3rd-Party Testing” icon, allowing you to review heavy metal levels and determine whether this product fits your personal protocol.

Oyster (Zn) is formulated using pure freeze-dried oyster meat along with a small amount of zinc glycinate. After extensive global testing, we selected our oyster source for its superior micronutrient profile and low heavy metal content.

While oysters naturally contain zinc, we wanted to provide a product that delivers a meaningful and consistent amount of bioavailable zinc. Pairing natural oyster zinc with zinc glycinate allows us to offer enhanced zinc support while still benefiting from the full spectrum of naturally occurring cofactors and minerals found in oysters.

Because nutritional needs and tolerances are highly bio-individual, we always recommend consulting with a trusted healthcare practitioner before supplementing during pregnancy. 

We are the only company that provides full nutrient content directly on every bottle, clearly outlining exactly which nutrients you’re receiving and in what amounts per serving. This level of transparency allows you to better assess where your nutritional needs are being met—and where gaps may still exist based on diet and other supplements.

Our capsules are made from 100% non-GMO bovine gelatin and contain no pork.

Our oysters are gently heated to 95°C (203°F) prior to freeze-drying. 

Freeze-drying preserves nutrients and shelf stability but does not eliminate harmful pathogens on its own. By fully cooking the oysters first, we significantly reduce the risk of microbial contamination while maintaining the integrity and nutritional value of the final product.

In contrast, our beef liver is freeze-dried raw, as it does not carry the same contamination risks as oysters and can be safely processed without a pre-cooking step.

The amount of zinc in an oyster supplement depends entirely on the oyster species, sourcing, and serving size. After six months of testing oyster samples from around the world, we learned that many oyster supplements marketed as high-zinc don't contain detectable amounts in a standard serving. This is why FRTIL Oyster (Zn) brings together 100% freeze-dried New Zealand oyster meat and zinc glycinate, delivering a meaningful, bioavailable dose in every capsule.

Oyster (Zn) was formulated as daily support to complement other nutrient dense foods. That said, we recognize not every product is meant for every person or every season, and it can also be used more intentionally as needed. Because zinc is a foundational mineral many individuals are quietly depleted in, we formulated Oyster (Zn) with a balanced dose designed to support replenishment without the excessive amounts commonly found in other formulas that may disrupt mineral balance over time.