Celebrity Biohacking Methods: What Famous People Actually Do, and What the Evidence Really Shows

Celebrity biohacking has become a major part of modern wellness culture, with famous people sharing longevity routines that promise improved energy, better healthspan and enhanced performance optimisation. From ice baths and intermittent fasting to NAD+ therapy and advanced biological testing, many of these approaches are promoted as ways to slow ageing or optimise health. However, it is not always easy to separate marketing from science. 

The insights in this article are provided by Vivere's Head of Nutrition, Yusra Serdaroglu Aydin MSc RD, a Dietitian with a background in nutrition, food engineering and culinary arts.

Drawing on peer-reviewed research alongside guidance from organisations such as the NHS and MHRA, this article explores celebrity biohacking methods, examines famous people's longevity routines and explains which evidence-based wellness strategies may genuinely support nutrition and lifestyle in the UK.

Celebrity biohacking methods combine lifestyle and clinical interventions such as intermittent fasting, cold exposure, NAD+ therapy, gut microbiome testing, nutrition, sleep and movement, but the strongest evidence supports improving healthspan and performance.

• Do celebrity biohacks work? 

Some celebrity biohacking methods have scientific support, particularly fasting and metabolic health interventions, while others require much stronger evidence before firm conclusions can be drawn.

• What is the single most effective "biohack"? 

A plant-rich diet combined with regular movement, good sleep and consistent healthy habits remains the single most effective evidence-based biohack.

• Are these methods safe and legal in the UK? 

Lifestyle approaches are generally safe for healthy adults.

• Can a gut test tell me my biological age? 

A gut microbiome test may provide useful educational insights, but gut test biological age estimates and microbiome test limitations mean they should not be viewed as medical diagnoses.

• When is biohacking most effective? 

Celebrity biohacking is most effective when evidence, safety and realistic expectations guide decisions rather than social media trends or marketing claims.

Celebrity biohacking methods are science-influenced routines that aim to improve health, slow ageing, increase energy and enhance performance by influencing cellular-level health through lifestyle changes and, in some cases, clinical interventions.

The term celebrity biohacking definition covers a broad spectrum of interventions. Some are simple daily habits such as time-restricted eating, structured exercise or improving sleep. Others involve more advanced approaches including cold-water immersion, intravenous NAD+, biological testing and wearable technology that tracks health metrics.

Many celebrities publicly discuss these practices as part of their health routines. One of the most widely recognised examples is Bryan Johnson, whose Blueprint longevity protocol combines carefully monitored nutrition, exercise, supplementation, sleep tracking and extensive biological measurements in an effort to support healthy ageing. His routine has brought greater public attention to biohacking, although many aspects remain experimental and are not representative of everyday healthcare.

What makes celebrity biohacking appealing is the promise of measurable improvements in health before illness develops. Rather than focusing only on treating disease, many biohacking approaches aim to optimise normal body function and extend healthspan. While this concept is attractive, not every intervention has the same level of scientific support.

"Many people are drawn to biohacking because it offers a sense of control over ageing and wellbeing. The most important question is whether an intervention is supported by high-quality evidence or whether it is being driven mainly by marketing. Understanding that difference helps people spend both their time and money more wisely."

Celebrity biohacking can be divided into several categories, each with different levels of scientific evidence and practical value for everyday health.

The most common biohacking categories include nutritional strategies, exercise, recovery techniques, supplements, medical interventions and biological monitoring. Many have reported celebrity links, but popularity alone does not confirm effectiveness.

When considering any biohack, it helps to ask four questions:

• What is the proposed biological mechanism?

• What does the current evidence appraisal show?

• Are the claimed benefits supported by human research?

• Is there a safe practical UK version that most people can follow?

The following sections explore some of the best-known celebrity biohacking methods and compare public claims with the available scientific evidence.

NAD+ therapy has become one of the most talked-about celebrity biohacks because it targets a naturally occurring coenzyme involved in cellular energy production and DNA repair, although human evidence remains limited.

Nicotinamide adenine dinucleotide (NAD+) is a coenzyme found in every cell of the body. It plays an essential role in converting nutrients into usable energy while supporting hundreds of biological reactions. Scientists also recognise its involvement in DNA repair and other important cellular processes.

Researchers have observed an age-related NAD+ decline across many tissues, making it an important area of longevity research. This has led to growing interest in interventions designed to increase NAD+ levels through supplements, IV drip therapy and injection treatments. However, while laboratory studies and animal research have produced encouraging findings, translating these results into proven health benefits for humans is still an active area of investigation [1].

Several celebrities and wellness clinics have popularised NAD+ therapy as a way to improve energy, mental clarity and healthy ageing. The proposed biological mechanism is scientifically plausible because NAD+ supports normal cellular function. However, proving that increasing NAD+ directly produces meaningful clinical improvements in healthy people requires more high-quality research.

One placebo-controlled crossover study involving 30 adults found that an NAD+ precursor increased NAD+ levels and was well tolerated. Although researchers reported some preliminary physiological effects, they concluded that larger studies are needed before clear clinical benefits can be confirmed [2].

For this reason, experts generally distinguish between what is currently known about NAD+ biology and what has actually been demonstrated in humans. While cells and animal studies versus human evidence continue to generate interest, the strongest conclusions must still come from well-designed clinical trials.

High-quality injectable NAD+ is available to buy from Vivere.

It is important to distinguish injectable NAD+ from related nutritional ingredients. Nicotinamide riboside (NR) has been authorised as a novel food in Great Britain, while nicotinamide mononucleotide (NMN) is not authorised as a novel food for sale in Great Britain [3].

"Your body naturally makes NAD+ using nutrients including vitamin B3 from niacin and tryptophan. Foods such as fish, poultry, eggs, wholegrains, peanuts and mushrooms all contribute to this process. Regular exercise also supports the NAD+ salvage pathway, making food-first nutrition and physical activity the strongest foundation for healthy ageing."

Intermittent fasting may support weight and metabolic health for some people, but current evidence suggests that food quality and overall dietary habits remain more important than meal timing alone.

Intermittent fasting has become one of the best-known celebrity wellness practices. Many athletes, actors and public figures use some form of time-restricted eating, where meals are eaten within a set daily eating window, often lasting between 8 and 10 hours.

Supporters suggest this approach can improve body composition, reduce inflammation and enhance metabolic flexibility. Some celebrity examples include Tom Brady, who has spoken about an anti-inflammatory approach to eating and fueling for performance. 

Footballers including Robert Lewandowski have also attracted attention for their reported eating habits, including meal sequencing or "backwards eating", where vegetables and protein are eaten before carbohydrates. Likewise, Harry Kane has been linked to carefully planned meal timing and nutrition supported by a personal chef to optimise body composition and recovery.

Although these examples are widely discussed, it is important to separate individual routines from scientific evidence. Elite athletes often have highly personalised nutrition plans developed around demanding training schedules. What works for a professional footballer may not be appropriate or necessary for the general public.

Research into time-restricted eating shows encouraging but moderate evidence. Reviews suggest it can support modest weight loss and improve some markers of metabolic health, but many benefits overlap with simply reducing overall calorie intake rather than the eating window itself [4] [5].

Current evidence also suggests that meal composition matters. Choosing meals rich in fibre and protein before refined carbohydrates may help reduce rapid blood-glucose spikes after eating. This approach forms part of broader precision nutrition, where dietary advice is tailored to an individual's health, preferences and lifestyle rather than relying on one universal eating pattern.

"Meal timing has its place, but food quality usually has a much greater impact on long-term health. One of the simplest ways to support your gut microbiome is to increase plant diversity. The American Gut Project found that people eating 30 or more different plant types each week tended to have greater gut microbiome diversity than those eating far fewer varieties [6].”

Home gut microbiome testing may complement precision nutrition by acting as an educational tool that encourages healthier food choices and greater dietary variety. However, it is important to recognise the limits of testing. Results should be interpreted alongside overall nutrition, lifestyle and personal circumstances rather than viewed as a definitive assessment of health.

Intermittent fasting can be unsuitable for some groups, and anyone with existing medical conditions should seek professional advice before making significant dietary changes.

Although intermittent fasting is generally well tolerated by many healthy adults, there are recognised fasting contraindications.

Fasting is usually not recommended during pregnancy or breastfeeding, for people with a disordered eating history, for those under 18, or for anyone taking glucose-lowering medication for diabetes without appropriate supervision.

If you have diabetes or another long-term medical condition, speak with your GP or dietitian before starting intermittent fasting. Individual health needs vary considerably, and personalised advice is always preferable to following online trends.

Cold-water immersion may provide a temporary mood boost and reduce feelings of stress for some people, but many of its broader health claims remain overstated.

Cold-water immersion, cold plunges and ice baths have become increasingly popular among athletes, celebrities and social media influencers. Advocates often describe these practices as a form of hormesis, where exposing the body to controlled stress may strengthen resilience over time.

The biological mechanism is well understood. Sudden cold activates the sympathetic nervous system, increasing the release of noradrenaline and triggering several physiological responses designed to maintain body temperature. Cold exposure also activates brown adipose tissue, often called brown fat, which helps generate heat.

Public figures including Wim Hof have popularised cold exposure alongside breathing techniques. Podcasts hosted by Joe Rogan have also contributed to widespread interest in cold plunges and saunas. Elite athletes such as Cristiano Ronaldo have reportedly used home cryotherapy chambers, while LeBron James has discussed cold plunges and cryotherapy as part of his recovery routine.

Scientific evidence paints a more measured picture than many online claims. A large 2025 meta-analysis found that cold-water immersion reduced stress at 12 hours, temporarily increased inflammation, and may improve sleep quality and quality of life, although the effects depended heavily on timing and were generally temporary [7].

Evidence supporting claims that cold exposure dramatically improves immunity, burns significant amounts of fat or slows ageing remains much weaker.

"If you enjoy a cold shower because it leaves you feeling more alert or lifts your mood, that can be a worthwhile free habit. However, the extra energy burned through brown fat activation is relatively small, so cold exposure should be viewed as a wellbeing practice rather than a weight-loss strategy."

Cold-water immersion is not suitable for everyone because the body's cold-shock response can place significant stress on the heart and circulation.

The cold-shock response causes a rapid rise in heart rate and blood pressure immediately after entering cold water. For people with underlying heart disease, arrhythmia, uncontrolled high blood pressure, Raynaud's or a seizure disorder, this sudden response may increase the risk of serious complications [8].

Open water introduces additional dangers including strong currents, hidden hazards and cold-water shock. Anyone considering outdoor cold-water immersion should prioritise open water safety, avoid entering water alone and understand local conditions.

People focused on muscle growth should also be aware that regular cold-water immersion immediately after resistance training may contribute to blunted muscle gains by reducing some of the inflammatory processes involved in muscle adaptation.

Evidence surrounding the Wim Hof Method also remains mixed. While some studies suggest potential benefits like reducing inflammation, a systematic review concluded that the overall quality of evidence is limited and more robust research is needed before firm conclusions can be drawn [9].

Sleep tracking can help people build healthier routines, but wearable technology is most useful when it supports good habits rather than creating unnecessary anxiety.

Many celebrities now use sleep tracking devices to monitor recovery, including smartwatches, sleep rings and other wearables that estimate deep sleep, resting heart rate and heart rate variability (HRV).

HRV is commonly used as an indicator of nervous system recovery, although day-to-day values naturally fluctuate due to stress, illness, exercise, alcohol intake and sleep quality.

Several high-profile athletes have highlighted the importance of recovery. Erling Haaland has spoken about using blue-light-blocking glasses and aiming for around ten hours of sleep. LeBron James has reportedly prioritised a screen curfew and sufficient sleep to aid recovery, while Cristiano Ronaldo has worked with a sleep coach and followed structured 90-minute sleep cycles alongside a consistent schedule.

The growing popularity of sleep tracking reflects increasing awareness that recovery is just as important as training. Sleep supports learning, memory, hormone regulation and immune function. During sleep, the brain also activates the glymphatic system, which helps clear metabolic waste products. Animal research suggests that the brain's interstitial space expands substantially during sleep, increasing this clearance process, although exactly how this translates to human brain health is still being mapped through ongoing research [10].

Rather than aiming for a perfect sleep score every night, most experts recommend focusing on sustainable habits that improve sleep quality over time.

"Sleep and nutrition are closely connected. Keeping regular sleep and wake times, getting morning daylight, avoiding large meals close to bedtime, and limiting caffeine later in the day can all help. Foods such as oats, dairy products, nuts and seeds, kiwi, tart cherries, bananas, and wholegrains can provide nutrients such as tryptophan, magnesium, calcium, and carbohydrates that may support a natural wind-down routine when combined with healthy sleep habits."

Many celebrity biohacks sound impressive, but the strongest scientific evidence consistently supports simple lifestyle habits over expensive or experimental interventions.

The biohacks most likely to improve long-term health are evidence-based habits that are inexpensive, sustainable and supported by decades of research.

Rather than searching for a single breakthrough intervention, most people benefit far more from building consistent daily routines that improve overall wellbeing.

Eating a diverse plant-rich diet provides fibre, vitamins, minerals and thousands of beneficial plant compounds that support the gut microbiome.

A practical target is to eat 30 plants a week, including vegetables, fruit, beans, lentils, herbs, spices, seeds, nuts and wholegrains. Variety appears to matter just as much as quantity because different gut microbes thrive on different types of plant foods.

A Mediterranean-style diet remains one of the best-supported eating patterns for long-term health.

Meals based around olive oil, fish, pulses, vegetables, fruit and wholegrains have consistently been linked with better cardiovascular health. The PREDIMED trial demonstrated that this dietary pattern reduced major cardiovascular events compared with a control diet, making it one of the strongest pieces of evidence supporting nutrition for healthy ageing [11].

Daily movement and regular resistance training provide some of the greatest returns for long-term health and independence.

Large analyses involving millions of participants consistently show that becoming even moderately more active is associated with substantially lower all-cause mortality [12]. Combining aerobic exercise with resistance training appears particularly beneficial for cardiovascular health and longevity [13].

Maintaining muscle is especially important with increasing age because muscle strength supports mobility, metabolic health and independence.

A regular sleep schedule, exposure to morning daylight and limiting stimulating activities late in the evening are among the simplest ways to improve recovery.

Sleep is a biological necessity rather than a luxury, and no wearable device can replace consistent healthy habits.

Distributing protein evenly throughout the day helps support muscle maintenance, particularly alongside regular exercise.

NHS guidance states that you should aim for around 30g fibre daily, in line with UK recommendations, by eating vegetables, fruit, beans, lentils and wholegrains. Foods rich in niacin also contribute to normal energy metabolism, supporting the body's natural production of NAD+ [14].

"The strongest evidence is often the least glamorous. Focus on eating a varied plant-rich diet, following a Mediterranean-style eating pattern, moving every day, building muscle, protecting sleep and limiting alcohol and ultra-processed foods before considering expensive interventions."

The Vivere gut microbiome test is designed as an educational wellness tool that helps people better understand how diet and lifestyle may influence their gut microbiome.

It is intended to support food-first guidance and encourage positive, everyday habit change. It should not be viewed as a medical diagnosis, nor should it replace advice from a healthcare professional where symptoms or concerns are present.

Many forms of biohacking are safe for healthy adults, but interventions involving medicines or injections are subject to UK regulation.

Everyday healthy habits such as improving diet, exercising regularly and getting enough sleep are generally considered safe for most people. However, prescription-only interventions and medical procedures should always be approached carefully.

Consumers should remain sceptical of dramatic claims that promise guaranteed anti-ageing, rapid biological reversal or permanent health transformation without strong supporting evidence.

Injectable therapies are among the most tightly regulated biohacking interventions in the UK.

Consumers should avoid assuming that treatments promoted through social media or celebrity endorsements have been proven effective simply because they are widely discussed.

Current home microbiome tests provide educational information, but they cannot diagnose disease or accurately determine biological age.

Direct-to-consumer microbiome tests offer insights into the composition of gut bacteria, but they cannot diagnose disease. At present, there are no regulator-approved clinical microbiome diagnostics for routine diagnosis of most diseases, and results vary considerably between providers.

The microbiome also changes naturally from day to day due to diet, illness, medication and many other factors. Likewise, biological-age tests, including those based on epigenetic clocks, remain an evolving area of science.

These technologies may help motivate positive lifestyle change, but they should be viewed as educational tools rather than definitive health assessments. Importantly, no home test should delay seeking appropriate medical care when symptoms are present [15].

NAD+ therapy is one of the most widely discussed anti-ageing biohacks among celebrities.

NAD+ is a naturally occurring coenzyme involved in cellular energy production and DNA repair. Because levels appear to decline with age, it has become an important research target. However, limited human evidence means claims about anti-ageing benefits remain unproven.

Many celebrities use biological-age testing based on epigenetic clocks, microbiome profiling and other biomarkers.

Although these technologies can provide interesting information, they are not validated clinical diagnostics. Results may vary between providers, and they are best viewed as tools that encourage positive lifestyle change rather than precise measures of ageing.

Simple lifestyle habits are generally safe, while medical interventions require appropriate clinical oversight.

Healthy eating, regular diet, exercise and good sleep are suitable for most people. More advanced clinical interventions should only be undertaken following assessment and supervision by a qualified UK professional. Consumers should also be cautious of advertisements promising dramatic guaranteed results.

Intermittent fasting can produce modest weight loss and improvements in some metabolic markers, but results vary.

Research suggests benefits are generally modest, particularly in people who are overweight, and evidence remains mixed. Overall diet quality over timing appears to have the greatest influence on health. Intermittent fasting is unsuitable for some groups, including people during pregnancy and those with a disordered eating history.

Cold showers may provide a temporary lift in mood and alertness, but many broader claims are unsupported.

For healthy adults, a cold shower can be a harmless daily habit that promotes a short-term mood and alertness lift. However, evidence does not currently support strong claims regarding fat loss or immunity. Anyone with a heart condition should seek medical advice before attempting cold-water immersion.

“Healthy ageing begins with curiosity balanced by critical thinking. Being a discerning consumer means asking whether new wellness trends are supported by evidence rather than marketing. Current research continues to favour increasing plant variety, aiming for 30 plants a week, following a Mediterranean-style diet, prioritising daily movement, building and maintaining muscle, protecting sleep and limiting excess alcohol and ultra-processed food. Ageing well is far more likely to result from consistent everyday habits than from chasing the latest celebrity trend."

Vivere helps you take control of your health with personalised insights from state-of-the-art gut microbiome testing, nutritional guidance, science-backed supplements, NAD injections and expert support. Sign up today and start living better, for longer. 

[1] NAD+ metabolism and its roles in cellular processes during ageing | Nature Reviews Molecular Cell Biology

[2] Chronic nicotinamide riboside supplementation is well-tolerated and elevates NAD+ in healthy middle-aged and older adults | Nature Communications

[3] Nicotinamide riboside chloride

[4] Time-Restricted Eating in Metabolic and Clinical Health: a Current Evidence and Mechanistic Insights - The Journal of Nutrition

[5] Effect of 8-Hour Time-Restricted Eating (16/8 TRE) on Glucose Metabolism and Lipid Profile in Adults: A Systematic Review and Meta-Analysis | Nutrition Reviews | Oxford Academic

[6] American Gut: an Open Platform for Citizen Science Microbiome Research | mSystems

[7] Effects of cold-water immersion on health and wellbeing: A systematic review and meta-analysis | PLOS One

[8] The effects of cold exposure (cold water immersion, whole- and partial- body cryostimulation) on cardiovascular and cardiac autonomic control responses in healthy individuals: A systematic review, meta-analysis and meta-regression - ScienceDirect

[9] Does the Wim Hof Method have a beneficial impact on physiological and psychological outcomes in healthy and non-healthy participants? A systematic review | PLOS One

[10] Sleep Drives Metabolite Clearance from the Adult Brain | Science

[11] Primary Prevention of Cardiovascular Disease with a Mediterranean Diet Supplemented with Extra-Virgin Olive Oil or Nuts | New England Journal of Medicine

[12] Non-occupational physical activity and risk of cardiovascular disease, cancer and mortality outcomes: a dose–response meta-analysis of large prospective studies | British Journal of Sports Medicine

[13] Associations Between Exercise Training, Physical Activity, Sedentary Behaviour and Mortality: An Umbrella Review of Meta‐Analyses - Rahmati - 2025 - Journal of Cachexia, Sarcopenia and Muscle - Wiley Online Library

[14] How to get more fibre into your diet - NHS

[15] Direct-to-consumer microbiome testing needs regulation - The Lancet Gastroenterology & Hepatology