Biohacking Kompakt

Peptide & Experimental

DNP (2,4-Dinitrophenol)

Warning: industrial chemical and mitochondrial uncoupler, misused as a fat burner, life-threatening · 2,4-dinitrophenol, DNP, 2,4-DNP, fat burner DNP

2,4-Dinitrophenol, DNP for short, is an industrial chemical that circulates in the fitness scene as a fat burner. It does work: the body burns more energy and releases it as heat. But precisely this mechanism makes DNP one of the most dangerous substances that appear in this scene at all.

In short

DNP uncouples the power plants of the cell: the mitochondria burn nutrients without gaining usable energy from them, and the rest becomes heat. That is why weight drops, and that is why body temperature can spiral out of control. In analyses of poison control center data from 38 countries, 11.9 percent of the reported poisonings were fatal, in the United Kingdom 16.9 percent. No safe amount is known, and there is no antidote. In Germany, DNP is permitted neither as a medicine nor as a food supplement, and it has been on the doping list since 2024.

What it is

DNP is a nitrophenol from the chemical industry. It was used for munitions, dyes, wood preservation, weed control and in photography. It is not approved as a medicine anywhere, and there is no recognized medical use.

Its history as a slimming agent begins in 1933. Maurice Tainter at Stanford University observed that people lost considerable weight on DNP; up to 1.5 kg per week was reported. The drug was then sold freely until the side effects caught up with it: in 1938, US law classified DNP as extremely dangerous and unfit for human consumption. Since the early 2000s it has been back as an illegal fat burner, according to the BfR mainly in the bodybuilding scene.

How it works

Mitochondria pump protons across their inner membrane and let them flow back through ATP synthase. This produces ATP, the energy currency of the cell. DNP channels protons past this wheel. The respiratory chain runs at full speed, fat and sugar are burned, but a large part of the energy is not stored as ATP but released as heat.

That is the reason for the weight loss, and at the same time the reason for the danger. The body can give off the additional heat only to a limited extent. A Swedish case report from 2026 describes why poisoning is so hard to stop: the uncoupling produces a lot of carbon dioxide, the tissue becomes more acidic, and in the more acidic environment the mitochondria take up even more DNP. The authors call this runaway uncoupling. In the case that survived, the effect only subsided with a functional half-life of 4.9 days.

Why people take it anyway

The appeal lies in the mechanism: DNP promises fat loss without the need to curb appetite, and faster than any diet. Surveys of users show a scene that knows the risk and considers itself in control. In a study with 35 users, from their point of view the experience of weight loss predominated; in 14 in-depth interviews in another paper, the leitmotif was having everything under control. The death statistics show that this control can be an illusion.

In addition, there is a problem buyers cannot see: the BfR reports products to which DNP had been added without it being on the label. Anyone taking a fat burner from an unclear source therefore does not know for sure whether they are swallowing DNP.

What happens in poisoning

The typical signs are high fever, racing heart, heavy sweating and rapid breathing. Later come acidification of the blood, confusion, muscle rigidity and organ failure. In an analysis of 204 cases from the US and the United Kingdom, acidosis, racing heart, agitation or confusion, and overheating were each independent predictors of a fatal course. In acute overdoses, the time to death averaged 14 hours.

Anyone who takes DNP for a longer period also risks cataracts. The BfR also mentions skin damage and effects on the liver, kidneys, blood, cardiovascular and nervous systems. Because DNP can accumulate in the body, even repeated smaller amounts can become life-threatening.

The relationship to BAM15

In forums, BAM15 is touted as the better, safer DNP. What is correct: BAM15 is a different molecule, does not depolarize the outer cell membrane in cell experiments and did not raise body temperature in mice. But BAM15 has not been studied in humans at all. This does not demonstrate a safety advantage in humans, and no recommendation can be derived from it.

What is well supported

Two things are established, and both are connected. First: DNP lowers body weight because it increases energy expenditure. The historical reports show this, and so does a modern modification. HU6 is a precursor that only becomes DNP in the liver and is intended to slow its release. In a placebo-controlled study with 80 participants, liver fat fell by a relative 26.8 to 35.6 percent after 61 days, while under placebo it rose by 5.4 percent. In a second study with 66 people with heart failure and overweight, participants lost 2.86 kg more over 19 weeks than under placebo, practically only fat, without their exercise capacity improving.

What the studies show

Poison control centers worldwide (Gziut and Thomas 2022)

Together with the WHO, the authors surveyed poison information centers worldwide; data came from 38 countries. Between 2010 and 2020, 456 cases of systemic DNP exposure were reported. Annual cases rose from 4 in 2010 to 71 in 2015 and stood at 53 in 2019. Where the outcome was known, 11.9 percent died, women and men equally.

US and United Kingdom (Potts et al. 2021)

Analysis of all poison control center calls on DNP from 2007 to 2018, a total of 204 cases, 86 from the US and 118 from the United Kingdom. 86 percent of those affected were younger than 40, 71 percent were men. Case fatality was 11.6 percent in the US and 16.9 percent in the United Kingdom.

The rise in the United Kingdom (Kamour et al. 2015)

The UK poison information service counted a total of 30 poisonings from 2007 to 2013, 22 of them in 2013 alone. Five people died, that is 17 percent. The most common signs were fever in 47 percent, racing heart in 43 percent and sweating in 37 percent.

Germany (BfR 2015)

Through physicians’ poisoning reports, the German Federal Institute for Risk Assessment initially learned of five DNP poisonings, three of them fatal, including a young woman who had taken DNP as a fat burner. In 2015, a further death in Germany was added.

Where the data stop

For DNP itself, there is no modern controlled study in humans. Everything known about the benefit comes from the 1930s or from studies with HU6, a different formulation under medical supervision that is not approved and not sold freely. The HU6 studies are also small and short. Their results cannot be transferred to powders or capsules of unknown origin. A safe amount has not been established, and user research notes that there is no established safe upper limit. It also remains unknown how many people take DNP without a poison control center ever hearing about it. The mortality figures therefore refer to reported, mostly severe cases, but they are remarkably similar across several countries and periods.

Status, approval and legal

DNP is not an approved medicine in Germany, the EU or the US. It may not be sold as a diet product, as a food supplement or as an ingredient for them; the BfR speaks of illegally added DNP. If it is offered as a weight-loss product, it can be considered a questionable medicine under pharmaceutical law, whose placing on the market is a criminal offense under § 5 and § 95 of the German Medicines Act (AMG). Under chemicals law, DNP is classified in the EU under the CLP Regulation as fatal if swallowed, toxic in contact with skin and if inhaled, and damaging to organs. In sport, it has been listed by name on the WADA Prohibited List under S0 since January 1, 2024, and is prohibited at all times, including in 2026. The German Anti-Doping Act refers to this list for trafficking and self-doping. The United Kingdom classified DNP as a regulated poison in 2023.

Safety

Acute signs are nausea, vomiting, sweating attacks, yellowing of the skin, overheating, shortness of breath, drop in blood pressure and cardiac arrhythmias, up to coma and death. There is no antidote; hospitals can only cool, stabilize and monitor. With longer use, cataracts and damage to the liver, kidneys, blood, cardiovascular and nervous systems threaten. DNP is not suitable for anyone. Anyone who has taken it and feels unwell, hot or agitated should not wait but seek medical help immediately.

BK-Score Hype far ahead of evidence

Human evidence3
Mechanism8
Safety data3
Hype gap2
Track record of use4

Evidence 3, because the effect of DNP itself in humans comes only from uncontrolled use in the 1930s (up to 1.5 kg per week, review Grundlingh et al. 2011); controlled data exist only for the unapproved precursor HU6, such as minus 2.86 kg versus placebo over 19 weeks in 66 participants (Pandey et al. 2025) and a relative minus 26.8 to minus 35.6 percent liver fat after 61 days in 80 participants (Noureddin et al. 2023). Mechanism 8, because the uncoupling of the respiratory chain has been understood for decades and has been measured in humans, most recently in the platelets of two poisoned people with a functional half-life of 4.9 days (Lindeman et al. 2026). Safety 3, because there are no controlled safety data on DNP; the toxicity is known from poison control center series, which are, however, large and internally consistent: 17 percent fatal in the United Kingdom 2007 to 2013 (Kamour et al. 2015), 11.6 and 16.9 percent in the US and United Kingdom across 204 cases (Potts et al. 2021), 11.9 percent across 456 cases from 38 countries (Gziut and Thomas 2022). Hype 2, because DNP is sold as a fat burner, while according to the consumer advice center the risks are often played down in advertising and the BfR reports undeclared DNP in products. Use 4, because DNP has been used in the scene since the early 2000s without any regulatory framework, documented by rising poison control center figures from 4 cases in 2010 to 71 in 2015. The negative direction refers to use outside of studies: the weight loss is real, but there is no recognized medical indication, no established safe amount and no antidote, and case fatality is in the double-digit percentage range in all analyses.

The score rates the state of knowledge, not the substance. “Safety data 9” means well studied – not harmless.
Subjective assessment by Biohacking Kompakt based on published scoring rules – not a scientific rating and not a medical recommendation. Rules and all ratings (German)

Frequently asked questions about DNP (2,4-dinitrophenol)

What is DNP?

DNP stands for 2,4-dinitrophenol, an industrial chemical. It uncouples energy production in the mitochondria, so that the body burns more energy and releases it as heat. It is not approved as a medicine anywhere.

Does DNP work for weight loss?

Yes, energy expenditure rises and weight drops. But the same mechanism can make body temperature rise uncontrollably. In poison control center analyses, depending on country and period, 11.6 to 17 percent of the reported poisoned people died.

Is there a safe amount of DNP?

No, a safe amount has not been established. DNP can accumulate in the body, which is why the BfR warns that even repeated smaller amounts can become life-threatening. No antidote exists.

Is DNP legal in Germany?

DNP is neither approved as a medicine nor permitted as a food supplement. Selling it as a slimming agent can be a criminal offense under the German Medicines Act. In sport it has been on the WADA Prohibited List since 2024.

Is BAM15 a safe alternative to DNP?

That is not established. BAM15 did not raise body temperature in mice, but it has never been studied in humans. Nobody knows whether it is safer in humans.

What should be done if someone has taken DNP?

In case of fever, racing heart, heavy sweating, shortness of breath or confusion, call emergency services immediately and explicitly mention DNP. Even without symptoms: seek medical advice or call one of the German states’ poison information centers; the BVL keeps the list. General practitioners are also points of contact, confidentially as well.

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Information only, not medical advice and not a usage or dosage recommendation. Prescription-only and unapproved substances belong in the hands of a physician. Last updated: 2026-09-27.