The human body accumulates more information than we usually imagine. Forgotten medications, pills taken without telling the doctor, and substances ingested unknowingly They can remain circulating in the blood, skin, or urine for weeks. Until now, much of this exposure went undetected, but an international scientific project has developed a tool capable of identifying many of these compounds.
It is a public digital library that accurately identifies drugs and other chemicals present in biological and environmental samplesThis platform allows healthcare professionals and researchers to know what medications are actually in the body, where they might come from, and how they might be influencing health—something crucial both in daily clinical practice and in studies of food and the environment.
The problem of medications that no one remembers taking
There are many reasons why drugs appear in the body. Some people strictly follow a prescribed treatment, but there are also many other reasons. self-medication, the use of leftover medications stored at home, and online shopping without medical supervisionThis is compounded by the presence of antibiotics in meat, pesticide residues in fruits and vegetables, and contaminants in drinking water.
In practice, Many people don't report everything they take or simply don't remember.However, these compounds can remain in the body: in blood, urine, skin, or even breast milk. For doctors, this lack of reliable information complicates diagnosis, treatment monitoring, and the detection of potentially dangerous drug interactions.
For years, health systems have had to work with a kind of blurry photograph of each patient's exposome, that is, the set of substances to which they have been exposed. Only a small fraction of the compounds present in the body were known.which made it almost impossible to know what different medications were circulating in each individual.
Faced with this scenario, an international consortium of experts posed an uncomfortable but fundamental question: Is it possible to objectively know what drugs and chemicals are in the body, beyond what the patient declares? The answer has come in the form of an open platform designed to bring some order to that chaos of molecules.
A global project led from California with European participation
The development of this tool has been led by researchers from the University of California, San Diego (United States)in collaboration with teams from numerous countries. The results have been published in the scientific journal Nature Communications., which supports the robustness of the methodology and the findings.
Scientists from United States, Norway, Czech Republic, Austria, Belgium, Finland, Spain, Canada, Brazil and SwitzerlandAmong others. The involvement of European centers, including those in Spain, reinforces the interest of the continent's scientific community in having tools that allow for a better characterization of exposure to medicines and pollutants.
Those responsible for the initiative work in the field of metabolomics, the discipline that studies the small chemical compounds present in living organismsUnlike other approaches that focus more on genes or proteins, metabolomics focuses on the final molecules that actually circulate in the body, many of them derived from drugs, food, or the environment.
Until now, even with advanced techniques, Only a limited fraction of all the substances detected in the samples could be identified.The new approach combines a massive database of “chemical fingerprints” with automated analysis methods to dramatically increase the percentage of compounds that can be recognized.
GNPS Drug Library: a library that archives chemical fingerprints
The heart of the project is the GNPS Drug Library, an open-access digital library that doesn't store books, but Mass spectra: the “chemical fingerprints” of thousands of medicines and their related productsEach drug leaves a characteristic pattern when analyzed by mass spectrometry, and that pattern is recorded in the database.
The procedure for the user is relatively simple. Doctors, researchers, or laboratory technicians can upload the data obtained from a sample of blood, urine, saliva, skin, food or waterThe system automatically compares these spectra with those it has stored and shows which substances match each detected signal.
The technology that makes it possible is the mass spectrometry, a technique that separates molecules according to their weight and chargeBy analyzing how the molecules are fragmented in the device, a kind of chemical barcode is obtained that the library uses to identify the compounds with very high precision.
The tool not only indicates whether a medication is present, but also provides information about its origin, what it is used for, what pharmaceutical class it belongs to and how it worksIn this way, the results can be interpreted even by professionals who are not specialists in pharmacy or biochemistry, which facilitates their integration into clinical practice and public health studies.
As the researcher explained Nina Zhao, one of the co-authors of the workThe query process is designed to be as straightforward as possible: simply upload the data set and, with a single click, the system returns the list of drugs and compounds detected in the sample, along with the information associated with each one.
What have tests on patients and the environment revealed?
To verify that the library functioned under real-world conditions, the team analyzed biological and environmental samples from nearly 2.000 people in the United States, Europe, and AustraliaThese studies were able to identify 75 different medications, mostly the most prescribed in each regionwhich allowed us to trace patterns of use and exposure.
In people with intestinal diseases, cavities, or other digestive problems Antibiotics consistent with prescribed treatments were detected. The same occurred with patients with Kawasaki disease, a rare inflammatory condition: the tool identified the drugs included in their therapies, serving as a consistency test.
In the field of dermatology, Antifungals were found in the skin of people with psoriasis and other skin conditions, again in line with standard treatments. In patients with Alzheimer A profile consistent with clinical guidelines emerged: cardiovascular medications and mood-targeting drugs were observed.
In the case of people with HIVThe library made it possible to identify both specific antivirals as treatments associated with other common pathologies in this groupThe presence of these compounds reflected the complex pharmacological combinations that are usually used in this type of patient.
The analysis also revealed geographical and gender differences. Samples from the United States showed a higher average number of medications per person compared to other regions. Furthermore, women showed more frequent use of analgesics, while men more frequently used erectile dysfunction medications.
Silent exposure through diet and environment
The usefulness of the GNPS Drug Library is not limited to monitoring medical treatments. A significant part of the work focused on food and environmental samples, with the aim of evaluating involuntary exposures that may go unnoticed in traditional questionnaires.
Various analyses detected antibiotics in meat productsThis finding aligns with the use of these drugs in livestock farming and raises questions about the contribution of diet to the development of bacterial resistance. Other findings included... pesticide residues in vegetablesThis is a particular concern in Europe, where regulations on agricultural waste are strict but not infallible.
The tool was also applied to water samples and other environmental matriceswhere chemical compounds derived from both medications and hygiene and cleaning products were located. These results allow for the creation of more precise maps of the chemical contamination to which different populations are exposed.
In the European context, this type of information can be especially relevant for food and environmental surveillance systems, including those in Spain. To have a detailed photograph of what substances reach the table or the tap It facilitates regulatory decision-making and the evaluation of the real impact of food safety policies.
For the general population, although the results do not automatically imply a direct risk, they do highlight that Daily exposure to certain compounds is more complex than it seemsand that tools of this type can help to refine both dietary recommendations and prevention strategies.
Applications in hospitals, research, and public health
One of the great strengths of this digital library is its versatility. In a clinical setting, it can help to check if patients are actually adhering to prescribed treatments.This is especially useful in chronic diseases where adherence to medication is key to avoiding complications.
Furthermore, by identifying drugs that are not listed in the medical record, The tool allows the detection of possible drug interactions. that might otherwise go unnoticed. This gives healthcare professionals additional leeway to adjust doses, substitute medications, or review combinations that may increase the risk of adverse effects.
In public health, the library opens the door to more detailed studies on the actual consumption of drugs in different populationsBeyond sales or prescription data, it also facilitates the monitoring of exposure to potentially hazardous substances from food, water, or personal hygiene products—an issue of growing concern to European health authorities.
In the field of research, the data generated by the GNPS Drug Library can be integrated with genetic, clinical, and environmental information to advance towards more personalized medicineKnowing exactly which compounds circulate in each person's body allows for the design of more tailored studies and the exploration of how they influence the response to treatments.
All of this positions this tool as a potentially valuable resource for hospitals, universities and research centers from Spain and the rest of Europe, where interest in combining omics data, electronic health records and environmental registries is increasing.
Current limitations and the role of artificial intelligence
Despite the leap forward that this digital library represents, the authors of the work themselves point out that The system is not perfectThere are very rare drugs, less stable formulas, or compounds that degrade rapidly and are still difficult to reliably identify.
To overcome these limitations, the team is working on continuously expand the database and integrate artificial intelligence techniquesAlgorithms can help recognize less obvious patterns, suggest likely matches, and speed up the processing of large volumes of information.
Another key element of the project is its collaborative approach. Any research group or laboratory can upload new data and contribute to enriching the library with more chemical footprints, which helps the system improve with use and adapt to very different contexts.
At the same time, the researchers stress the importance of interpreting the results with caution and always in combination with the clinical and environmental information of each case. The detection of a compound does not automatically imply a health problem.but it does provide a valuable clue to better understand what is happening in the body.
The possibility of obtaining, with just a few clicks, a detailed list of drugs and chemicals present in a sample marks a turning point. The digital library that reveals hidden drugs in the body It is emerging as a tool destined to change both the way research is conducted and the way personalized medicine and environmental monitoring are approached in the coming years.
