Experimental Approaches and Self-Experimentation: Risks and Limits

Safety first

This page describes risks and limits. It gives no protocols, doses, sources or how-to steps, and we do not recommend self-injecting, implanting or using unregulated compounds. If you have taken something and feel unwell, call US Poison Help at 1-800-222-1222, or 911 in a US emergency. See poisoning: what to do first. For a mental health crisis in the US, call or text 988.

Labels used here: approved medicine, insufficient evidence, evidence of harm and marketing claim.

Two very different things share the word "experiment"

Biohacking has been described as do-it-yourself citizen science that merges body modification with technology, and its community has raised questions about ethics, safety and consent. [1] Under that one word sit two very different activities:

• Low-risk comparison. Noticing how you feel after changing something ordinary and reversible, such as comparing two bedtime routines or keeping a note of comfortable walks. The method is covered in our guides on defining a clear question and changing one low-risk variable at a time.
• Going past medical oversight. Using injections, implants, unapproved compounds or extreme exposures outside any regulated setting. These are the activities this page warns about.

Where do-it-yourself goes too far

• Self-administered gene therapy. The FDA says gene therapy products intended for self-administration, and "do it yourself" kits to make them, are being made available to the public, that the sale of these products is against the law, and that it is concerned about the safety risks. It advises consumers to check that any gene therapy has been approved by the FDA or is being studied under appropriate regulatory oversight. [2]
• Implants. Chip implants in the hand are typically not placed in a medical environment, and can lead to complications such as infection and tendon attrition. Researchers note their safety implications have not been extensively studied. [3]
• Unapproved compounds. In the US, the FDA says tianeptine is not approved for any medical use, yet it is marketed as a "research chemical," a "nootropic" cognitive enhancer or a dietary supplement. [4] The FDA has also reported receiving severe adverse event reports for some tianeptine products, including seizures, loss of consciousness and death. [4] For peptides and unapproved weight-loss drugs, see peptide safety and adverse events and compounded and unapproved GLP-1 products.
• Extreme fasting, heat, cold, breath-holding and similar practices. We did not read enough regulator material to make claims about these, and we give no instructions. Please speak to a clinician first. The gentler end of heat and cold is covered in cold and heat exposure.

Not every self-experiment with medicines is safe because it is "just you." Never start, stop or change a prescribed medicine because of something you read.

Why a personal experiment is weak evidence

Even a harmless experiment can mislead. A formal single-person study is called an N-of-1 trial. It compares outcomes in one person during periods with an intervention and a comparator, and researchers note that it can require strong assumptions in the analysis to estimate cause and effect. [5] Informal "try it and see" experiments usually lack that structure. Common traps include:

• Chance and ordinary ups and downs. See regression to the mean in personal data.
• Other things changing at the same time. See recording context and confounding factors.
• Expectation. In one set of studies, people told their sleep was above or below average performed differently on cognitive tasks depending on what they were told, not on their reported sleep. [6]

Animal or cell findings are labeled preclinical and are not proof for people; see reading early-stage research.

Who should not experiment

Anyone who is pregnant, a child or teenager, has a chronic condition, a history of disordered eating, or takes prescription medicines should involve a clinician first. See when not to experiment and talking with a health professional. Self-tracking itself can have a psychological cost for some people; researchers have called for more study of its adverse psychosocial effects. [7]

Stop signs

Stop and seek care for fever, redness or swelling at a skin site, chest pain, fainting, seizures, severe allergic reaction or confusion.