Biohacking & Circadian Living · Module 02
Remove Before
You Add
The Clean Foundation
Most wellness conversations start with what to take, what to buy, what to add. This one starts somewhere else. Because it turns out that removing a handful of quiet daily exposures often produces more change than adding a dozen supplements — and most of it costs nothing.
"You cannot out-supplement a Teflon pan. You cannot out-biohack eight hours of synthetic fabric on your skin. Clean the foundation first — then everything you build on top of it actually works."
The Idea
Why Subtraction Comes First
Every biohacking practice in this workshop — red light, hydrogen water, breathwork, PEMF — works by supporting or stimulating a biological process that is already trying to function. But if that process is simultaneously being disrupted by something in your daily environment, the net effect is a fraction of what it should be.
The body has three primary routes of exposure to its environment: skin, lungs, and gut. Most people manage what goes in through the gut with some care. Very few think about what is in direct contact with their skin for 8 hours a night, or what they are breathing inside a sealed building all day. This module closes those gaps.
The Three Routes of Exposure — What the Body Is Processing Daily
Skin — 24 hours of contact
Bedding, sleepwear, clothing, personal care products, cookware. The skin is the body's largest organ and a direct absorption pathway — whatever is on it goes in.
Lungs — 20,000 breaths daily
Indoor air quality, VOCs from furniture and paint, cleaning product fumes, mould spores. Indoor air is typically 2–5× more polluted than outdoor air (EPA).
Gut — food, water, cookware
What you eat and drink is the route most people manage consciously. What it is cooked in, stored in, and what is in the water used to prepare it — less so.
8h
Skin contact with bedding and sleepwear every night
2–5×
Indoor air more polluted than outdoor (EPA data)
£0
Cost of most changes in this module
The Kitchen — Gut Route
What to Remove from Your Kitchen — and Why
Tap each to understand the mechanism behind the swap.
Non-stick Teflon cookware
→▾
Cast iron · Ceramic · Stainless
PFAS — the coating on non-stick pans — are classified as persistent environmental contaminants. When heated above 260°C, or when scratched, they release compounds that accumulate in liver, thyroid, and immune tissue over time. PFAS have been detected in blood samples worldwide, including in newborns. The half-life in the human body is 3–7 years — meaning every pan you cook with today is still contributing to your body burden years from now.
Cast iron adds trace iron (beneficial for most women, who are commonly iron-deficient). Ceramic and stainless require more fat but contribute nothing toxic in exchange. A well-seasoned cast iron pan is functionally non-stick and lasts a lifetime.
Cast iron adds trace iron (beneficial for most women, who are commonly iron-deficient). Ceramic and stainless require more fat but contribute nothing toxic in exchange. A well-seasoned cast iron pan is functionally non-stick and lasts a lifetime.
PFAS · Liver accumulation · 3–7yr half-life
Tap water unfiltered
→▾
Filtered · Mineralised · Celtic salt
Municipal tap water regularly contains: fluoride (an industrial by-product and iodine competitor that suppresses thyroid function and has been found to calcify the pineal gland in animal studies), chlorine and chloramine (gut microbiome disruptors), pharmaceutical residues including synthetic oestrogens from birth control, microplastics, and in some regions agricultural run-off.
A counter-top carbon filter handles chlorine, chloramine, and many pharmaceuticals. Reverse osmosis removes more — but always re-mineralise stripped water before drinking, as it is biologically inert and can actually leach minerals from the body. Add a pinch of Celtic salt or Baja Gold to filtered water for trace minerals. Avoid Himalayan salt — it has been found to contain significant levels of heavy metals including lead.
A counter-top carbon filter handles chlorine, chloramine, and many pharmaceuticals. Reverse osmosis removes more — but always re-mineralise stripped water before drinking, as it is biologically inert and can actually leach minerals from the body. Add a pinch of Celtic salt or Baja Gold to filtered water for trace minerals. Avoid Himalayan salt — it has been found to contain significant levels of heavy metals including lead.
Fluoride · Microplastics · Pharmaceutical residue
Plastic food and water containers
→▾
Glass · Stainless steel
BPA-free labelling replaced one phthalate with BPS, BPF, and others of similar endocrine-disrupting concern. Heat, UV exposure, and acidity all accelerate leaching — meaning hot food in a plastic container, acidic drinks in a plastic bottle, or a reusable bottle left in a hot car is consistently delivering synthetic compounds directly to the digestive system. Microplastics from plastic containers have now been found in human blood, breast milk, placental tissue, and lung tissue.
Glass and stainless steel are chemically inert. One-time purchase. Lasts years. This is among the simplest and highest-impact swaps in the module.
Glass and stainless steel are chemically inert. One-time purchase. Lasts years. This is among the simplest and highest-impact swaps in the module.
Phthalates · Microplastics in blood · Heat accelerates leaching
The Bedroom — Skin Route · 8 Hours Every Night
Natural Fibres — Why What Touches Your Skin While You Sleep Matters More Than Anything Else
Eight hours of skin contact with any material is the longest single daily exposure your body has to anything. During sleep, the body is in repair mode — skin absorption is elevated, the immune system is active, and the body is attempting to regenerate every tissue system. What surrounds it during those hours is not a neutral variable.
Polyester · Nylon · Acrylic bedding
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Linen · Organic cotton · Wool
Polyester, nylon, and acrylic are petroleum-derived synthetic fibres. During sleep, they off-gas low-level volatile organic compounds (VOCs) through direct skin contact. Synthetic fibres also trap heat — preventing the core temperature drop of 1–2°C that is essential for initiating and sustaining deep slow-wave sleep. Every hour you spend too warm in synthetic bedding is an hour of compromised sleep architecture — directly reducing the deep sleep where growth hormone is released and cellular repair happens.
Synthetic textiles also carry a significant electrostatic charge that builds up on the body during movement — an additional low-level environmental stressor that natural fibres do not produce.
Synthetic textiles also carry a significant electrostatic charge that builds up on the body during movement — an additional low-level environmental stressor that natural fibres do not produce.
VOC off-gassing · Heat trapping · Electrostatic charge
Synthetic sleepwear — polyester pyjamas
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Cotton · Linen · Silk · Nothing
The skin breathes. It regulates temperature, releases metabolic waste through sweat, and absorbs compounds it comes into contact with. Synthetic sleepwear creates a sealed microclimate against the body — trapping heat, moisture, and off-gassing petrochemical compounds directly against the largest organ of absorption you have, for 7–9 hours.
Sleeping without clothing on natural fibre bedding is the simplest solution. If clothing is preferred, 100% cotton, linen, or silk — all of which breathe, thermoregulate, and introduce no synthetic chemical load to the skin.
Sleeping without clothing on natural fibre bedding is the simplest solution. If clothing is preferred, 100% cotton, linen, or silk — all of which breathe, thermoregulate, and introduce no synthetic chemical load to the skin.
Skin absorption · Thermoregulation · Overnight detox pathway
Not all natural fibres are equal. Here is what to look for:
Linen
①Best overall · Year-round
Made from flax — one of the most sustainable, durable, and breathable natural fibres available. Naturally anti-microbial. Thermoregulates exceptionally — cool in summer, warming in winter. Becomes softer with every wash. Higher initial cost but outlasts any synthetic bedding by years. The ancestral fabric of the Mediterranean world for good reason.
Organic Cotton
①Most accessible · Look for GOTS certified
Conventional cotton is one of the most pesticide-intensive crops on earth — residues remain in the fibre. Organic cotton (GOTS certified) eliminates this. Soft, breathable, widely available. The GOTS certification also covers dyeing processes — important since fabric dyes are another route of skin exposure.
Wool
Temperature regulation · Winter weight
Merino wool in particular is extraordinarily good at regulating body temperature across a wide range — naturally moisture-wicking, anti-microbial, and fire-resistant without chemical treatment. High-quality merino is soft enough for direct skin contact. Exceptional for winter and for those who run cold overnight.
Silk
Skin & hair · Temperature sensitive
Natural protein fibre with a smooth surface that reduces friction on skin and hair — relevant for people with sensitive skin or those managing hair condition overnight. Naturally hypoallergenic. Temperature-regulating though not as robustly as linen or wool. Pillowcase upgrade is the most impactful single silk purchase.
Personal Care — Skin Route · Daily Accumulation
What You Put On Your Skin — Goes In
The average person applies 9–12 personal care products daily — moisturiser, deodorant, shampoo, toothpaste, sunscreen, makeup. Most contain compounds that were never tested in combination, and several contain ingredients with documented hormonal, neurological, or carcinogenic effects at doses that accumulate with daily use over years.
Ingredient
The concern
What to use instead
Aluminium salts
Deodorant/antiperspirant
Deodorant/antiperspirant
Absorbed through underarm skin — close to breast tissue. Detected in breast tumour biopsies. Antiperspirant prevents the body's primary detox pathway for that region.
Crystal deodorant (potassium alum — different molecular structure, does not penetrate skin) · Magnesium-based deodorant · Bicarb formulations
Fluoride
Toothpaste
Toothpaste
Industrial by-product. Competes with iodine at thyroid receptors. Animal studies show calcification of the pineal gland. Labelled "do not swallow" — yet applied twice daily in the mouth.
Hydroxyapatite toothpaste (rebuilds enamel without fluoride) · Activated charcoal · Botanical formulas with xylitol and neem
Synthetic fragrance
Everything
Everything
"Fragrance" is a legal loophole covering up to 3,000+ undisclosed synthetic compounds including phthalates (endocrine disruptors), synthetic musks (neurotoxic, bioaccumulative), and parabens.
Fragrance-free formulations · Products using essential oils only · Check labels for "parfum" — same thing
Chemical sunscreen filters
Sunscreen
Sunscreen
Oxybenzone and octinoxate detected in blood within 2 hours of application. Oxybenzone is a known endocrine disruptor. Both are now banned in Hawaii due to coral reef destruction.
Mineral sunscreen (zinc oxide or titanium dioxide) · Non-nano particle formulations for full barrier protection without absorption
Sodium lauryl sulphate
Shampoo · body wash
Shampoo · body wash
Strips the skin and scalp's natural protective microbiome. Disrupts the acid mantle — the skin's primary barrier against pathogens and environmental toxins. Damages hair protein structure.
SLS-free formulas · Co-wash · Bar soap with simple ingredient lists · Water-only washing for scalp (adaptation period 2–3 weeks)
Indoor Air Quality — Lung Route · 20,000 Breaths Daily
The Air Inside Your Home — Often More Toxic Than Outside
The EPA has consistently found that indoor air contains 2–5 times more pollutants than outdoor air in most developed countries. Modern buildings are well-sealed for energy efficiency — which means whatever is off-gassing inside stays inside. VOCs from furniture, paint, carpet, and cleaning products accumulate in a way that outdoor air dispersion prevents.
Open windows — the most impactful single act
10–15 minutes of cross-ventilation daily dramatically reduces VOC accumulation. Morning air — before traffic peaks — is typically the cleanest. Prioritise bedroom ventilation before sleep and upon waking. This costs nothing and has an immediate measurable effect on indoor air quality.
Houseplants — documented VOC absorption
NASA's Clean Air Study identified specific plants that absorb VOCs including benzene, formaldehyde, and trichloroethylene from indoor air. The most effective: Spider plant, Peace lily, Snake plant (Sansevieria), Pothos, Boston fern. One plant per 9–10 square metres is a reasonable density for meaningful effect. A secondary benefit: increased humidity reduces airborne pathogen transmission.
HEPA air filter — especially for bedroom
A HEPA filter captures particles down to 0.3 microns — including dust mites, mould spores, pet dander, pollen, and many airborne microplastics. Running one in the bedroom overnight means 7–9 hours of significantly cleaner air during the body's primary repair window. The bedroom is the highest priority because it is where the most time is spent in a sealed environment. A basic unit costs €50–80 and filters should be replaced every 6–12 months.
Natural cleaning products — stop adding pollutants
Conventional cleaning sprays, bleach products, and synthetic air fresheners are among the primary sources of indoor VOC load — particularly ironically, during the act of "cleaning." Castile soap, white vinegar, bicarbonate of soda, and pure essential oils handle the vast majority of domestic cleaning tasks with zero toxic off-gassing. Avoid synthetic air fresheners entirely — they are VOC delivery systems masquerading as hygiene products.
The Digital Environment · EMF · Light
The Bedroom at Night — Three Things to Change
The bedroom at night is the most important environment to manage. The body spends more time here than anywhere else, in its most vulnerable and regenerative state. Three digital changes — none of which cost anything — produce measurable effects within days.
The Phone — Outside the Bedroom
Phone on aeroplane mode, in a different room. Separate alarm clock.
The anticipatory arousal of having a notification-capable device within reach — even face-down, even silent — raises baseline cortisol and delays slow-wave sleep onset. Research from the University of Gothenburg found this effect is independent of actual screen time: the device's mere presence is the variable. Eight hours of slightly elevated cortisol, every night, compounded over years, is not a small thing.
The EMF consideration is secondary. The behavioural one is primary — and requires no belief in any particular science to act on.
The anticipatory arousal of having a notification-capable device within reach — even face-down, even silent — raises baseline cortisol and delays slow-wave sleep onset. Research from the University of Gothenburg found this effect is independent of actual screen time: the device's mere presence is the variable. Eight hours of slightly elevated cortisol, every night, compounded over years, is not a small thing.
The EMF consideration is secondary. The behavioural one is primary — and requires no belief in any particular science to act on.
The Router — Off Overnight
WiFi router on a plug timer — off from 11pm to 7am.
A simple plug timer costs under €10. The precautionary case for reducing RF signal during sleep is inexpensive and low-effort. The research on WiFi and sleep quality is inconclusive but directionally consistent — and since the downside is essentially zero, this is an easy implementation. Many people report noticeably deeper sleep within a week.
A simple plug timer costs under €10. The precautionary case for reducing RF signal during sleep is inexpensive and low-effort. The research on WiFi and sleep quality is inconclusive but directionally consistent — and since the downside is essentially zero, this is an easy implementation. Many people report noticeably deeper sleep within a week.
Blue Light After Dark — The Most Important Light Change
No overhead LED lighting after 9pm. Dim, warm, low.
Blue-spectrum light suppresses melatonin production via the ipRGC photoreceptors in the retina — even brief exposure after dark can delay melatonin onset by 60–90 minutes. Modern LED overhead lighting is blue-dominant. The simple act of switching to a single warm lamp or candles after dinner — and putting on amber-tinted glasses for screen use — is one of the highest-leverage circadian interventions available. Red light therapy devices are specifically compatible with evening use as they do not suppress melatonin.
Blue-spectrum light suppresses melatonin production via the ipRGC photoreceptors in the retina — even brief exposure after dark can delay melatonin onset by 60–90 minutes. Modern LED overhead lighting is blue-dominant. The simple act of switching to a single warm lamp or candles after dinner — and putting on amber-tinted glasses for screen use — is one of the highest-leverage circadian interventions available. Red light therapy devices are specifically compatible with evening use as they do not suppress melatonin.
How to Think About All of This
Three Principles
Chronic low-level exposure accumulates differently than acute exposure
A single meal cooked in a scratched Teflon pan is not a medical event. Cooking in one every day for twenty years is a different calculation — particularly because PFAS have a 3–7 year half-life in the body and do not clear quickly. Most of what this module addresses operates in the chronic, cumulative category. No single change will produce a dramatic immediate change. The combination of several changes, sustained, often feels surprisingly significant within weeks.
Start with the bedroom — it is where you spend the most time
Eight hours. Every night. The bedroom is the single highest-leverage environment to address — bedding material, air quality, light, and devices all interact during the window when the body is most vulnerable and most actively repairing. Prioritise the bedroom first. The rest of the home follows.
This module costs almost nothing
Phone to aeroplane mode: free. Window open: free. Router timer: €10. Natural cleaning products: often cheaper than conventional. Linen bedding: higher upfront, lower lifetime cost. Cast iron pan: one-time purchase that lasts a generation. The financial barrier to the clean foundation is essentially zero — which means the barrier to not doing it has to be equally low.
"Think of the clean foundation not as restriction but as clearing static. When the background noise goes quiet, everything else you do — the red light, the breathwork, the hydrogen water — becomes more audible."
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