Biohacking is the practice of making deliberate changes to your body, diet, environment, or lifestyle to improve physical and mental performance. It ranges from simple habits like adjusting your light exposure to extreme experiments like implanting microchips under your skin. The global biohacking market hit $37.63 billion in 2025 and is projected to reach over $200 billion by 2035, reflecting just how fast this movement is growing.
What makes biohacking different from general wellness is the mindset: treat your biology like a system you can test, measure, and optimize. Some approaches are backed by solid science. Others are experimental, unregulated, or outright risky. Here’s how the landscape breaks down.
The Main Types of Biohacking
Biohacking isn’t one thing. It covers at least four distinct approaches, each with its own community, tools, and level of risk.
Nutrigenomics focuses on how food affects your gene expression. The core idea is that what you eat sends chemical signals that can switch certain genes on or off. Your cells constantly integrate signals from your diet, and nutrients like vitamins and plant compounds influence how your DNA is read and used. Nutrigenomics practitioners use genetic testing to personalize their diets, avoiding foods that may activate unfavorable gene pathways and emphasizing ones that support better metabolic function.
DIY biology is the garage-lab wing of biohacking. People run biology experiments at home, sometimes with surprisingly sophisticated tools. At-home CRISPR kits now exist that let users edit genes in yeast, producing visible mutations that change the organism’s color. These kits were originally developed for remote college courses, but they’ve also found a market among hobbyist biologists. The work stays mostly at the level of microorganisms, but the accessibility of gene-editing technology has raised serious regulatory concerns.
Grinders represent the most extreme end. This subculture implants technology directly into the body, most commonly RFID or NFC microchips in the hand. These implants can unlock doors, log into computers, make contactless payments, and store medical records. A survey of 2,000 people in the UK and EU found that 51% would consider getting an RFID chip implanted as a payment method. Some grinders go further, experimenting with magnets implanted in fingertips to “sense” electromagnetic fields or with chemical injections intended to alter perception.
Quantified self is the data-driven approach, where people use wearables and lab tests to track biomarkers and then adjust their habits based on the numbers. This is the most mainstream form of biohacking and often overlaps with the other types.
What Biohackers Actually Track
The quantified self movement revolves around a handful of key metrics. Heart rate variability, or HRV, is one of the most popular. HRV measures the variation in time between heartbeats and serves as a window into how well your nervous system is regulating stress, recovery, and overall resilience. Higher resting HRV is consistently linked to better outcomes across multiple health domains.
Research using consumer wearables found that people with higher nighttime HRV tended to have lower blood sugar levels, lower triglycerides, fewer depression symptoms, greater resilience, and better sleep quality. On a day-to-day basis, nights with higher HRV correlated with less mental exhaustion the next day, better executive functioning over the following 48 hours, and lower alcohol consumption. These aren’t huge effects individually, but they paint a consistent picture: HRV captures something real about your body’s baseline state.
Beyond HRV, biohackers commonly monitor sleep stages, continuous glucose levels, blood oxygen, resting heart rate, and periodic blood panels for markers like inflammation, cholesterol, and hormone levels. The goal is to spot patterns, test interventions (a new supplement, a different sleep schedule, a cold plunge routine), and measure whether anything actually changes.
Cognitive Enhancement and Nootropics
Nootropics, sometimes called “smart drugs,” are substances taken to sharpen thinking, memory, or focus. They’re one of the most accessible entry points into biohacking. The category is broad, covering everything from caffeine and L-theanine to prescription medications and exotic plant extracts.
Researchers classify nootropics into four general groups: classical nootropic compounds, substances that increase brain metabolism and blood flow, compounds that boost the brain’s chemical signaling systems, and plant-based extracts with cognitive effects. Some work by increasing blood flow to the brain. Others support the production or availability of neurotransmitters involved in attention and memory.
The evidence varies wildly depending on the substance. Caffeine has decades of research behind it. Many herbal nootropics have promising but limited data. And some popular compounds sold online have almost no human clinical trials supporting their marketing claims.
Light, Cold, and Environmental Hacking
Not all biohacking involves pills or implants. A significant branch focuses on manipulating your environment to change how your body functions, particularly through light exposure and temperature.
Blue light, in the 460 to 480 nanometer range, is the most potent signal for setting your circadian clock. Specialized cells in your retina detect this wavelength and relay it directly to the brain region that controls your body’s internal timing. This pathway regulates melatonin production, sleep cycles, mood, and even metabolism. Biohackers use this knowledge in two directions: getting bright blue-spectrum light in the morning to anchor their circadian rhythm, and blocking it at night with amber-tinted glasses or screen filters to protect melatonin production and sleep quality.
Cold exposure, through cold showers, ice baths, or cryotherapy, is another popular environmental hack. Practitioners report improved alertness, mood, and recovery from exercise, though the strength of evidence varies by claimed benefit.
The Longevity Frontier
Anti-aging biohacking has become its own subculture, with people experimenting on themselves using compounds originally studied in laboratory animals. The most discussed strategies target cellular aging at its root: clearing out damaged “senescent” cells that accumulate with age and release inflammatory signals.
A combination of two compounds, one originally developed as a cancer drug and the plant pigment quercetin, has shown the most clinical progress. Early-phase trials in people with mild Alzheimer’s disease found it was safe and reduced markers of cellular aging and inflammation in both blood and spinal fluid. A pilot study in older adults at risk for Alzheimer’s showed improvements in cognitive and mobility measures compared to placebo. In animal studies, this combination reduced the brain plaques and tangled proteins characteristic of Alzheimer’s.
Metformin, a common diabetes medication, has also attracted attention after large observational studies found that people who took it long-term had lower rates of dementia. An analysis of over 41,000 patients showed that stopping metformin early was associated with a 21% increased risk of dementia, and this protective effect appeared to go beyond simple blood sugar control.
Other longevity-focused supplements like NMN and resveratrol are widely sold and used in the biohacking community, but their clinical evidence in humans remains thin compared to the compounds in active trials.
Safety and Legal Boundaries
The DIY spirit of biohacking runs directly into regulatory limits, especially around gene editing. The FDA has explicitly warned that gene therapy products intended for self-administration, including DIY kits designed to produce gene therapies at home, are illegal to sell. The agency’s statement is blunt: the sale of these products is against the law, and the FDA is concerned about the safety risks involved.
The risk landscape varies enormously by category. Tracking your sleep with a wearable is essentially zero-risk. Adjusting your diet based on genetic data carries little downside if done thoughtfully. Taking unregulated nootropics or longevity supplements introduces more uncertainty, since many lack rigorous human safety data. And implanting devices or injecting substances sits at the far end of the risk spectrum, where infections, immune reactions, and unknown long-term effects are real possibilities.
The biohacking community generally self-organizes around shared protocols and open data, but there’s no quality control equivalent to clinical trials. What works for one person, tracked through their own metrics, may not generalize, and the placebo effect is powerful when you’re closely monitoring your own results and expecting improvement.