Costco is well known for offering bulk items at great prices, but not all products are worth buying—especially from a health and environmental perspective. Some household staples contain harmful substances that can affect human health and the environment. This blog is an analysis of a video by Non-Toxic Dad, who highlights four specific items that he avoids at Costco due to their potential risks. Here’s a deeper look into his claims, backed by research and environmental science.

Aluminum Foil and Parchment Paper: Hidden Toxins in Food Preparation

Non-Toxic Dad raises concerns about aluminum foil, a kitchen staple that many people use daily. He points out that aluminum is a known neurotoxin, and research supports this claim. According to a study published in Environmental Sciences Europe, excessive exposure to aluminum has been linked to neurodegenerative diseases, including Alzheimer’s disease. The concern is heightened when aluminum is heated, as it can leach into food, especially acidic or salty dishes, increasing the aluminum levels in your body.

A 2012 study in Food and Chemical Toxicology found that aluminum levels in food wrapped in foil exceeded safety limits set by the World Health Organization (WHO). Cooking or wrapping food in aluminum foil, particularly at high temperatures, can unknowingly introduce this harmful metal into meals. Non-Toxic Dad suggests that people should opt for alternative cooking methods to avoid unnecessary exposure.

Parchment paper is often thought to be a safer alternative, but Non-Toxic Dad points out that many commercial brands, including those found at Costco, have a silicone coating that can break down at temperatures as low as 200°F. This process releases siloxanes, chemical compounds linked to hormone disruption and potential cancer risks. The European Food Safety Authority (EFSA) has warned about the long-term accumulation of siloxanes in the body, which may lead to adverse effects on the liver and reproductive system. While parchment paper is convenient, Non-Toxic Dad recommends being mindful of the coatings used.

Healthier Alternatives: Use unbleached parchment paper, reusable silicone baking mats, or glass and ceramic baking dishes for safer cooking.

Tuna: A Heavy Metal Concern

One of Non-Toxic Dad’s biggest concerns at Costco is bulk-buying tuna due to its high mercury levels. Mercury is a toxic heavy metal that accumulates in the body over time, potentially leading to neurological issues, developmental disorders, and cardiovascular problems.

A 2021 study published in Environmental Research found that mercury exposure from seafood consumption is a significant concern, particularly for pregnant women and children. The U.S. Food and Drug Administration (FDA) and the Environmental Protection Agency (EPA) recommend limiting consumption of high-mercury fish, such as albacore and yellowfin tuna, to no more than one serving per week.

A 2016 analysis from the Environmental Working Group (EWG) tested popular canned tuna brands and found that 20% of tested samples exceeded federal mercury limits. Non-Toxic Dad argues that bulk-buying tuna at Costco can lead to overconsumption, inadvertently increasing one’s exposure to mercury toxicity.

Healthier Alternatives: Opt for sardines, wild-caught salmon, or plant-based seafood options that provide essential omega-3 fatty acids without the heavy metal contamination.

Plug-in Fragrances: Toxic Air in Your Home and Car

Non-Toxic Dad warns against plug-in air fresheners, which are commonly found at Costco. These products often contain volatile organic compounds (VOCs), phthalates, and synthetic fragrances that contribute to indoor air pollution and long-term health risks. The Environmental Protection Agency (EPA) states that VOC exposure can lead to headaches, dizziness, respiratory issues, and even long-term effects such as organ damage and cancer.

A 2019 study in Environmental Health Perspectives found that many commercial air fresheners contain phthalates, which have been linked to hormone disruption, reproductive toxicity, and metabolic disorders. Phthalates interfere with the endocrine system and have been associated with increased risks of obesity, diabetes, and developmental issues in children. The American Lung Association warns that synthetic air fresheners release chemicals that worsen asthma and allergies, making them particularly dangerous for people with respiratory conditions.

Non-Toxic Dad recommends switching to natural alternatives like essential oil diffusers, beeswax candles, or activated charcoal air purifiers. Research from the Harvard School of Public Health suggests that indoor plants can also significantly improve air quality by filtering out VOCs and toxins.

Healthier Alternatives: Use essential oil diffusers, simmer pots with natural ingredients like citrus peels and cinnamon, or activated charcoal air purifiers for a safer home environment.

Making Safer Choices for Your Home and Health

Non-Toxic Dad’s video highlights the importance of being mindful of what we purchase and bring into our homes. Avoiding these common Costco purchases can help reduce exposure to toxic substances while making more environmentally friendly choices. By opting for non-toxic food storage solutions, safer seafood options, and natural home fragrance alternatives, you can protect your health and support sustainability.

Additionally, spreading awareness about these issues can encourage more people to make informed purchasing decisions. Large retailers like Costco can also be influenced by consumer demand, pushing them to stock safer, more sustainable products. The more we prioritize health-conscious and eco-friendly choices, the greater impact we can have on industry practices and public health standards.

In an era where convenience often comes at a hidden cost, taking small steps toward safer and more sustainable living can lead to long-term benefits for both individuals and the planet.