A doctor advises the use of this plant, which obsessed Fidel Castro, to purify murky water as a substitute for chlorine and boiling.

14ymedio, March 18, 2026 – Madrid / With the energy crisis as a trigger, Cuba is moving at a rapid pace toward a public health crisis in which the inability to manage garbage collection and the lack of electricity to operate the water supply system are delivering the final blow. Two years ago, when the economic situation was not so alarming, barely half of the population had safe access to water, a figure that has dropped sharply in the current context and in the face of which, inexplicably, Cubadebate now offers a high-risk recipe: moringa seeds.
This Tuesday, government newspaper published a text signed by Johann Perdomo Delgado, a doctor specializing in Natural and Traditional Medicine and head of the department and national group of that specialty at the Ministry of Public Health. With these credentials, the expert presents the natural properties of moringa as an almost magical solution for “the purification of drinking water” and places it practically on the same level as chlorination or even something much simpler and more economical: boiling.
The doctor reviews the medicinal uses of moringa, an invasive plant that grows without any control in Cuba and whose properties were an obsession of Fidel Castro, particularly in the last years of his life. Among them are “antioxidant, anti-inflammatory, antihypertensive, diuretic, antimicrobial, antipyretic, antidiabetic, hypolipidemic, anti-ulcer, antineoplastic, cardio, and hepatoprotective” properties. continue reading
There are up to 90 nutrients in the plant, including proteins, vitamins, and minerals, but its seeds also have, he adds, the ability to “reduce turbidity and eliminate up to 99% of the bacteria”
There are up to 90 nutrients in the plant, including proteins, vitamins, and minerals, but its seeds also have, he adds, the ability to “reduce turbidity and eliminate up to 99% of the bacteria” present in water in a “short settling period.” According to the text, this helps prevent several diseases transmitted by unsafe water, such as cholera, other diarrheal diseases, dysentery, hepatitis A, typhoid fever, and poliomyelitis.
Although the note admits that “for the prevention of infectious diseases transmitted by water, chlorination is a well-known and advisable method that makes it possible to eliminate harmful microorganisms,” it recklessly claims that with moringa seeds it is possible to “guarantee from home the consumption of safe water, through the use of this plant resource.”
In addition, it explains the recipe, as simple as removing the shell from about ten seeds of the plant, crushing them into a paste, and mixing them with 20 liters of water. After stirring and mixing for three minutes, it is enough to let it sit for between an hour and a half or two hours and filter it with a clean cloth. “With this method, according to studies carried out that have proven its harmlessness, it is possible to obtain water that is suitable for human and animal consumption. In this way, especially in the case of natural disasters or other emergencies, resorting to moringa seeds is a way in which we can guarantee the care of our health… all natural!” the text adds casually.
The World Health Organization (WHO) does indeed cite the many natural properties of moringa and has reviewed countless studies on the use of its seeds to purify water. There are at least 20 publications in the institution’s IRIS repository containing information on water treatment using this method, particularly for developing countries, but its benefits are more limited than Cubadebate suggests.
Although they observe that the results are promising, they note that “they still face significant limitations that restrict their widespread use”
The main property of the seeds for this use lies in coagulating cationic proteins, which have a positive surface charge, as a natural way to make dirty (turbid) water appear clear; they adhere to dirt like a magnet. The cleaning is real, but relative. As the doctor himself says, it can reach 99%, although the WHO considers it may be reduced to 90%, leaving enough margin for the consumed water to contain viruses and parasites capable of causing illness. For this reason, science always recommends that this be, at most, a preliminary step to chlorination or, in cases where that is not possible, boiling.
The Pan American Health Organization (PAHO) manuals for water treatment do recognize the use of moringa seeds for a first step: removing turbidity. But this must be followed necessarily by either of the two previously mentioned methods or, in more extreme cases, the SODIS method, widely used in emergency areas with considerable success and consisting of exposing water to sunlight for long hours with extreme precautions regarding the container used.
At the beginning of 2026, the WHO published a study conducted in Brazil on the “viability of plant-based coagulants, including moringa, in water purification,” which in turn reviewed previous publications, with the aim of “advancing sustainable, low-cost treatment solutions.” However, although they observe that the results are promising, they note that “they still face significant limitations that restrict their widespread use.”
Translated by Regina Anavy
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