Folk Remedies and Health Hacks: An Evidence-Based Assessment of Hirudin, Silver-Ion Water, and Black Sesame

Folk Remedies and Health Hacks: “Natural,” Testimonials, and Early Research Do Not Guarantee Efficacy

Bottom line

From celery juice, oral hirudin, silver-ion water, eco-enzyme preparations, and bioresonance to black sesame and Polygonum multiflorum, the current evidence is insufficient to support broad claims of treating disease or reversing gray hair. Some of these practices also carry clear signals of harm.（PMID: 34987326）（PMID: 41550636）（PMID: 41855372）（PMID: 38678793）（PMID: 9066509）（PMID: 39359282）（PMID: 25648693）

The central problem with folk remedies: claims run ahead of evidence

In Professor Ching-Shun Lin’s longstanding examinations of folk remedies, the point is not to dismiss everything labeled “alternative.” It is to require proponents to provide evidence that actually corresponds to the disease, product, and method of use being claimed. A single case can only suggest a direction for research. Animal or mechanistic studies cannot directly prove efficacy in humans. Likewise, an environmental application, an antimicrobial effect in vitro, or the efficacy of an injected drug cannot be repurposed as proof that an oral supplement treats every disease.

For celery juice, the directly verifiable evidence currently consists of one case in which it was combined with other interventions. It can therefore do no more than generate a hypothesis about lowering blood pressure; it cannot establish causality, much less support expansive claims that celery juice treats cancer, diabetes, autoimmune diseases, depression, and other conditions.（PMID: 34987326）This agrees with Professor Lin’s careful qualification that it “might” lower blood pressure but that the finding cannot be extrapolated. Failure to locate sufficient research does not justify the categorical assertion that no study exists anywhere in the world. The correct conclusion is that evidence for the therapeutic claims is insufficient.

Hirudin has an effective anticoagulant mechanism, but that does not make an oral product effective

Hirudin is a polypeptide derived from the salivary glands of leeches and consists of 65 or 66 amino acids. It potently inhibits thrombin and produces an anticoagulant effect. Professor Lin’s original description of its identity and mechanism is consistent with later reviews.（PMID: 41550636）Yet “this molecule has a pharmacological action” and “swallowing it will treat disease” are two different propositions.

Legitimate clinical forms are produced through recombinant technology, and the conventional formulation has traditionally been injectable. Other delivery routes remain under investigation. A product’s natural leech origin or its sale as an oral preparation cannot substitute for validated pharmaceutical manufacturing and administration conditions.（PMID: 41550636）（PMID: 41977337）Orally administered proteins and peptides face degradation by gastrointestinal digestive enzymes as well as intestinal mucosal and epithelial barriers, and therefore generally have extremely low bioavailability. Professor Lin’s question—whether oral hirudin can escape degradation, cross the intestinal wall, and reach the circulation—is aligned with the current literature.（PMID: 41369159）（PMID: 41953894）

The literature has not established clinical efficacy for oral hirudin and does not indicate that an oral hirudin drug has been approved. The literature has evolved, and boundary cases involving other oral peptide drugs do exist, but they depend on particular molecular properties and sophisticated formulations. They do not validate oral hirudin or the promise that a “natural” oral product can cure every disease.（PMID: 41939723）（PMID: 41550636）Conversely, treating “all orally administered proteins invariably lose every function” as an absolute law also goes beyond the evidence reviewed here. Oral TGF-β2 has entered clinical studies in adults. The more defensible statement is that local intestinal effects may be possible, while absorption, clinical benefit, and the relevant use case must each be tested separately.（PMID: 26776879）（PMID: 36079847）（PMID: 27553420）

Early psoriasis studies do not automatically establish a therapy

XP-828L appeared in early randomized controlled studies of psoriasis from 2006 to 2008. This supports the historical context behind Professor Lin’s observation that “a small number of early papers” existed. It is nevertheless insufficient to establish full efficacy from titles and publication types alone, and it does not justify describing the product as an established psoriasis treatment.（PMID: 17234108）（PMID: 18069904）（PMID: 18590350）Scientific appraisal must consider the results, reproducibility, subsequent accumulation of evidence, and clinical role—not merely count whether “papers exist.”

Silver can kill microbes, but that does not mean silver-ion water can be taken orally to treat disease

Silver has specific antimicrobial applications, but this does not prove that drinking silver-ion water can treat urinary or gastrointestinal conditions, hepatitis, Helicobacter pylori infection, diabetes, or cancer. Current reviews find no demonstrated medical benefit or reliable clinical efficacy for oral colloidal silver, consistent with Professor Lin’s rejection of sweeping claims that it is a miraculous cure.（PMID: 41855372）（PMID: 40159095）

Safety cannot be discounted by calling a product “natural” or citing testimonials. Ingested silver can be absorbed and cause argyria, and it raises concerns about other systemic toxicities. Human cases of serious adverse events provide a further warning: when no benefit has been demonstrated, an exposure risk should not be repackaged as routine health maintenance.（PMID: 24231525）（PMID: 37767535）

Eco-enzyme preparations are materials for environmental uses, not wound medicines

Eco-enzyme preparations fermented from sugar, fruit peels or kitchen waste, and water have mainly been studied for environmental treatment. These data do not support their use in treating wounds, diabetic foot disease, skin disorders, or gynecological conditions.（PMID: 38678793）（PMID: 39834196）The commonly cited 1:3:10 preparation ratio does appear in environmental research, but verifying a recipe only shows that “someone prepared it this way.” It is entirely different from proving medical utility.（PMID: 31786032）（PMID: 39834196）Thus, when claims of “countless” uses are extended into medical promises, the corresponding human clinical evidence remains absent.（PMID: 38678793）

Bioresonance and skin resistance cannot replace allergy diagnosis and care

Bioresonance has been promoted as a treatment for atopic dermatitis in children, but a double-blind randomized trial found no additional benefit of active treatment over sham treatment. The method therefore cannot be extrapolated into a therapy for allergies or other diseases.（PMID: 9066509）Skin resistance measurement, or electrodermal testing, is likewise not a reliable diagnostic method for food allergy or IgE-mediated allergy. The literature classifies it as an alternative diagnostic approach without scientific support; it should not be used to plan treatment or impose dietary restrictions.（PMID: 39022151）

Black sesame and Polygonum multiflorum: anxiety about gray hair should not lead to ineffective or liver-damaging remedies

There is currently no clinical evidence that eating black sesame can prevent, delay, treat, or reverse gray hair. Reviews of gray-hair treatment do not identify black sesame as an effective therapy, and evidence-based treatment remains lacking overall.（PMID: 37781032）（PMID: 39359282）Professor Lin’s central position in the original article—that claims about black sesame making hair grow and turn black are unsupported—is consistent with the literature.

Positive signals for Polygonum multiflorum still come mainly from animal, in vitro, or ex vivo hair-follicle research. Although scientific progress has added mechanistic data, it still has not shown that the herb reverses gray hair in human clinical practice.（PMID: 26640791）（PMID: 42146009）（PMID: 39359282）By contrast, systematic evidence and case reports support an association between Polygonum multiflorum and liver injury, including potentially severe outcomes. Professor Lin’s warning that it may cause hepatotoxicity is therefore well grounded in safety evidence.（PMID: 25648693）（PMID: 30066422）

Practical appraisal: ask the complete set of evidence questions

When evaluating any folk remedy, check each point in sequence: Is the research on the same product and formulation? Were the participants human? Do the disease and endpoint match the claim? Was there an appropriate control? Can the result be independently replicated? Were harms fully disclosed? Using an injected drug’s efficacy to endorse an oral product, environmental research to endorse wound care, or changes in animal hair follicles to endorse reversal of gray hair in humans all cross the boundaries of the evidence.

Responsible conclusions also require nuance. Insufficient evidence does not mean absolute ineffectiveness has been proven. A signal in a single study does not establish a therapy. A biological mechanism does not mean swallowing a product will deliver an effective dose. A history of traditional use does not automatically cancel toxicity. For remedies that may delay treatment or cause harm, testimonials should no longer be treated as evidence; a qualified healthcare professional should assess the disease and risks.