Research Library

The science behind every recommendation

Particula is built on peer-reviewed research — not wellness trends. This is where we break down the studies, quantify the exposure, and show our work. Every number in the assessment and the Defense Protocol traces back to a published source.

Evidence Reviews
Evidence Review 8 min read · McGill, 2019

Nylon Tea Bags & Microplastics: What 11.6 Billion Particles Per Cup Means

A single plastic mesh tea bag releases roughly 11.6 billion microplastic and nanoplastic particles into your cup at brewing temperature. We unpack the landmark McGill study, why it happens, what the health implications are, and the ten-minute switch that eliminates the exposure entirely.

Read the full review →
Coming soon

Bottled vs. filtered water

What the WHO's 325-particles-per-litre figure really means — and which filters actually remove microplastics.

Coming soon

Non-stick cookware & PTFE

How a scratched pan sheds thousands of particles per session, and the inert alternatives worth switching to.

The Four Exposure Pathways
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Dietary Ingestion

Packaging migration, processing contamination, and bioaccumulation in seafood. Shellfish concentrate particles; can linings and sea salt add measurable load.

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Beverage Contamination

Bottled water averages ~325 particles/litre (WHO, 2019). Plastic tea bags release ~11.6 billion particles per brew; coffee pods leach plasticizers.

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Indoor Inhalation

Synthetic carpet, upholstery, and clothing shed fibres into indoor air continuously. A single polyester wash can release up to 700,000 fibres.

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Cookware Abrasion

PTFE-coated non-stick pans shed up to 9,100 particles per damaged cooking session, accelerating once scratched or overheated above 260°C.

How We Evaluate Evidence

Not all findings carry equal weight. Throughout the assessment and the Protocol we distinguish between confirmed human findings (microplastics detected in blood, placenta, and lung tissue), animal and in-vitro evidence (mechanisms shown in controlled studies but not yet confirmed at human exposure levels), and emerging associations still being characterized.

Where the science is settled, we say so. Where it is still developing, we say that too. Our scoring heuristics are calibrated to published aggregate exposure literature, and the assessment results are framed as relative risk versus population averages — not a medical diagnosis.

Foundational Research
  1. Cox KD et al. (2019). Human consumption of microplastics. Environmental Science & Technology, 53(12), 7068–7074. doi:10.1021/acs.est.9b01517
  2. Herbes C et al. (2019). Plastic tea bags release billions of microparticles into tea. Environmental Science & Technology, 53(21), 12300–12310. doi:10.1021/acs.est.9b02540
  3. Ragusa A et al. (2021). Plasticenta: first evidence of microplastics in human placenta. Environment International, 146, 106274. doi:10.1016/j.envint.2020.106274
  4. Leslie HA et al. (2022). Discovery and quantification of plastic particle pollution in human blood. Environment International, 163, 107199. doi:10.1016/j.envint.2022.107199
  5. WHO (2019). Microplastics in Drinking Water. World Health Organization
  6. Senathirajah K et al. (2021). Estimation of global population exposure to microplastics. Environmental Pollution, 268, 115940. doi:10.1016/j.envpol.2020.115940
  7. EFSA CONTAM Panel (2016). Presence of microplastics and nanoplastics in food. EFSA Journal, 14(6), 4501. doi:10.2903/j.efsa.2016.4501

See where you stand

The free assessment turns this research into a personal exposure score across 15 factors — and shows you which sources matter most for you.