Home & Kitchen — Cookware
Your cookware is part of
your ingredients
The pot you cook in is never neutral. Every meal is prepared in contact with a material — and that material, under heat, with acidic foods, over years of repeated use, becomes part of what you eat. Most people spend more time choosing their ingredients than the vessel those ingredients are cooked in. Shake thinks both deserve the same attention.
Material Literacy
Not all cookware is equal.
Here is what the research shows.
Understanding the material your cookware is made from is the single most important decision in the kitchen. The table below summarises each material’s safety profile, leaching behaviour, and Shake’s assessment — so you can make the most informed choice possible.
| Material | Shake Assessment | Key Considerations |
|---|---|---|
| Non-stick / PTFE / Teflon | Avoid | PFAS compounds released above 230°C. PFOA-free labelling does not mean PFAS-free. Coating degrades over time — every scratch accelerates exposure. No safe long-term option. |
| Aluminium (uncoated) | Avoid | Peer-reviewed studies show aluminium leaches significantly into food — especially acidic foods. XRF analysis revealed aluminium cookware is commonly contaminated with lead. Reactive and not recommended for daily use. |
| Copper (unlined) | Avoid | The FDA warns against unlined copper — it leaches into acidic foods causing copper toxicity. Lined copper (tin or stainless interior) is safer but the lining wears. Requires inspection over time. |
| Stainless steel 201 / 430 | Avoid | Lowest grade stainless — prone to rust, higher leaching risk with acidic foods, poorer corrosion resistance. Often found in cheap cookware sets. If no grade is listed, assume low quality. |
| Enamelled cast iron | Use with care | The enamel coating eliminates direct iron-to-food contact and is PFAS-free. Excellent heat retention. Avoid chips or cracks — damaged enamel can expose the underlying iron and may leach lead from older glaze formulations. Choose reputable brands like Le Creuset. |
| Stainless steel 304 (18/8) | Good | The industry standard for safe cookware. 18% chromium, 8% nickel. Non-reactive with most foods, no PFAS, durable. Trace nickel leaching can occur with prolonged cooking of acidic foods — manageable with cooking habits. A solid, safe daily choice. |
| Stainless steel 316 (surgical grade) | Very good | The molybdenum content in 316 grade provides 43% less heavy metal leaching than 304 in acid tests. Used in surgical instruments for this reason. Significantly more resistant to pitting and corrosion with acidic foods. The best stainless steel option for daily cooking. |
| Borosilicate glass | Excellent | Completely inert — zero leaching, zero chemical reaction under heat. The most chemically pure cooking and storage surface available. Ideal for baking, sauces, and food storage. Cannot be used on direct flame — designed for oven use. |
| 100% Pure ceramic (kiln-fired) | Highest tier | No metal core, no coatings, no PFAS, no synthetic materials of any kind. Triple-fired at 2,500°C. Third-party tested — does not leach lead, cadmium, or heavy metals. California Prop 65 compliant. Completely inert with acidic foods. The most materially pure cookware available. Xtrema is the leading brand in this category. |
What to be mindful of
What prepares your food
becomes part of you.
The most common cookware materials in most households carry significant material concerns that are rarely discussed. Understanding what happens to these materials under heat — particularly with acidic foods — is the foundation of conscious kitchen decision-making.
01
Non-stick coatings — the PFAS problem
PTFE-based non-stick coatings — including those branded as Teflon — release toxic compounds when heated above 230°C. Scratched or worn coatings accelerate this process at lower temperatures. The “PFOA-free” label is widely misunderstood: PFOA is one PFAS compound, but there are thousands. Removing PFOA while retaining PTFE or replacement PFAS chemicals does not make a pan safe. The only solution is removing coatings entirely.
02
Aluminium — the most overlooked risk
Aluminium cookware is one of the most common in the world — and one of the least safe. Peer-reviewed studies have shown significant leaching of aluminium into food, particularly acidic foods like tomatoes, citrus, and vinegar-based dishes. Research using XRF analysis found aluminium cookware commonly contaminated with lead. This exposure compounds daily. Aluminium is not a material Shake curates toward under any formulation.
03
Heat, acid, and metal migration
Leaching is not a theoretical concern — it is a documented, pH-dependent, temperature-accelerated physical process. Studies show that cooking acidic foods (tomatoes, wine, citrus, vinegar) in reactive metals significantly increases metal migration into food. The longer the cooking time and the higher the temperature, the greater the leaching. This is why material choice matters most for slow-cooked, acidic dishes — the meals most people associate with nourishment.
04
Ceramic-coated vs pure ceramic
The cookware market has embraced the word “ceramic” — but ceramic-coated pans and pure ceramic pans are fundamentally different products. Ceramic-coated pans use a thin sprayed layer over an aluminium or stainless steel core. That coating degrades over time, chips under metal utensils, and once compromised exposes the underlying metal. Pure ceramic — kiln-fired all the way through — has no coating to degrade and no metal core to expose.
05
Stainless steel grade matters enormously
Not all stainless steel is the same. The difference between 201-grade (commonly found in cheap sets) and 316-grade (surgical steel) is not cosmetic — it is chemical. Laboratory acid tests show 316-grade stainless steel produces 43% less heavy metal leaching than 304-grade under the same conditions. If a brand does not publish the steel grade on its cookware, treat it with appropriate scepticism.
06
Daily repetition is the real variable
A single meal cooked in aluminium, low-grade stainless, or a scratched non-stick pan presents minimal acute risk. The concern is cumulative — three meals a day, every day, for years, in contact with reactive materials, constitutes a sustained low-level exposure that the body must process. Conscious cookware is not a luxury — it is one of the highest-leverage daily health decisions available to most households.
What prepares your food,
becomes part of you
What to look for
Inert materials. Transparent brands.
Cookware built to last generations.
The goal is cookware that contributes nothing unwanted to your food — now or in twenty years. These are the materials and markers that define conscious kitchen investment.
100% pure ceramic
Kiln-fired pure ceramic is the most inert cooking surface available. No metal core, no coating, no PFAS — completely stable under heat and with acidic foods. Third-party tested for lead and cadmium leaching. The material that genuinely contributes nothing to your food. Xtrema is the market leader in this category, triple-fired at 2,500°C with quarterly independent testing published publicly.
316-grade stainless steel
When stainless steel is the choice, 316 surgical grade is the standard worth seeking. The addition of molybdenum creates significantly greater corrosion resistance than 304-grade — particularly important for acidic cooking. All-Clad and Made In publish their steel grades clearly. If a brand does not disclose its grade, that silence is informative.
Enamelled cast iron (reputable brands)
The enamel glaze on cast iron eliminates direct metal contact with food — removing the reactive iron concern for acidic dishes. Le Creuset has maintained its enamel formulation standard for over 100 years. Choose brands with documented enamel safety records and replace any piece where the enamel has chipped. Never use vintage or unbranded enamelled cookware — glaze formulations pre-2000 may contain lead.
Borosilicate glass for baking
For oven cooking, baking, and food storage, borosilicate glass is completely inert — the same material used in laboratory equipment for precisely this reason. Nothing leaches, nothing reacts, nothing degrades. Pyrex and similar brands offer excellent food-safe borosilicate bakeware at accessible price points. The most overlooked conscious kitchen upgrade.
Published material grades & third-party testing
The single most important filter when evaluating cookware brands is whether they publish the specific grade of materials used and independent test results. Any brand using vague terms like “non-toxic,” “chemical-free,” or “eco-friendly” without supporting data is relying on marketing, not transparency. Xtrema publishes quarterly lab reports. Made In publishes its steel grade. This is the standard.
Longevity as a health principle
A Le Creuset Dutch oven purchased today will outlast most kitchens. A Xtrema ceramic pot, properly cared for, is a generational piece. An All-Clad 316 stainless pan is designed to last decades. Conscious cookware is not consumable — it is investment. Every replacement of a non-stick pan that has reached the end of its coating life is another cycle of PFAS entering the environment and the home. Longevity and health are the same principle.
Featured Brand
Xtrema
100% Pure Ceramic · No Metal · No Coating · Third-Party Tested
Xtrema makes the only truly pure ceramic cookware available for stovetop use at scale. Every piece — from the skillet to the Dutch oven — is made from a single, solid piece of kiln-fired ceramic: clay, water, and natural minerals. No metal core. No ceramic coating over aluminium. No synthetic glues, polymers, or dyes. Triple-fired at 2,500°C and third-party tested quarterly for lead, cadmium, and heavy metal leaching — results published publicly. It is the most materially honest cookware available at any price point.
Why It Aligns
- 100% pure ceramic — no metal, no coating, no PFAS of any kind
- Third-party tested quarterly — lead, cadmium, and heavy metals all non-detectable
- California Prop 65 compliant — one of the most stringent safety standards globally
- Completely inert with acidic foods — tomatoes, wine, citrus, vinegar, no concern
- Triple-fired at 2,500°C — structural integrity without synthetic reinforcement
- Designed to last generations — the opposite of disposable cookware culture
Conscious Alternatives
Moving in a more conscious direction.
These brands are not presented as perfect. They represent cookware built from materials that have stood the test of time — stainless steel grades worth specifying, enamel coatings from brands with century-long reputations, and transparency about what their products are made from.
All-Clad
304 Stainless Steel · Tri-Ply · USA Made · No Coatings
All-Clad’s D3 and D5 lines use fully-clad stainless steel construction — an aluminium core bonded between layers of 304-grade stainless steel on both the interior and exterior. The cooking surface is pure stainless — no coatings, no PFAS. Recommended by almost every chef and material safety expert as the benchmark for daily stainless steel cooking.
- 304-grade stainless steel cooking surface — no coatings or PFAS
- Fully-clad construction for even heat — aluminium core never contacts food
- Made in the USA — transparent manufacturing and material specifications
Le Creuset
Enamelled Cast Iron · PFAS-Free · 100+ Year Heritage
Le Creuset’s enamelled cast iron is one of the most trusted cookware materials in the world. The enamel glaze creates a smooth, non-reactive barrier between the iron and the food — eliminating direct metal contact with acidic dishes. PFAS-free, chip-resistant when properly maintained, and backed by a lifetime guarantee. A genuinely generational investment.
- Enamel glaze eliminates direct iron-to-food contact — safe with acidic foods
- PFAS-free throughout — no synthetic coatings of any kind
- Lifetime guarantee — built to be passed down, not replaced
Made In
316 Stainless Steel · Five-Ply · Fully Published Grade
Made In publishes its steel grade explicitly — 316-grade stainless steel on the cooking surface, chosen specifically for its superior corrosion resistance with acidic foods. Five-ply construction provides exceptional heat distribution. Transparent about materials, pricing, and manufacturing in a category where most brands offer neither.
- 316-grade stainless steel cooking surface — the surgical steel standard
- Five-ply construction — even heat, no hot spots, no warping
- Fully published material specifications — grade, sourcing, and composition
Material & Ingredient Awareness
The pot is part of the recipe.
Metal leaching from cookware is not a fringe theory — it is a documented, peer-reviewed phenomenon studied extensively in food science and toxicology. A 2023 study published in the Journal of Food Protection found significant migration of aluminium, lead, nickel, and chromium from common cookware types into food during cooking, with acidic foods and high temperatures producing the highest transfer rates. The researchers concluded that leaching from aluminium and copper cookware constitutes a potential public health risk.
The stainless steel grade distinction matters more than most consumers realise. The molybdenum content in 316-grade steel — the same specification used for surgical implants and marine hardware — creates a passive oxide layer that resists pitting corrosion from acids and chlorides far more effectively than 304-grade. Under identical cooking conditions with acidic foods, 316-grade produces 43% less heavy metal migration. For a pan used three times a day, this compounds into a meaningful lifetime difference.
Pure ceramic cookware — kiln-fired all the way through — represents the most conservative and materially simple cooking surface available. It has been used for over 10,000 years. There are no coatings to degrade, no metal cores to expose, and no synthetic materials of any kind. The heat retention properties of dense ceramic also mean cooking can often be done at lower temperatures — reducing both energy consumption and the rate at which any material interaction could theoretically occur.
“Choose your cookware the way you choose your ingredients — with full awareness of what it is, where it came from, and what it contributes to every meal you prepare in it.”
The pot is part of the recipe —
choose its material as carefully as its contents
Every meal begins before the first ingredient goes in.
It begins with what you choose to cook it in.
Awareness over overwhelm · Clarity over confusion · Conscious choices over blind consumption