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Kidney Function Decrease

Adverse effect

Kidney Function Decrease is an adverse health effect referring to reduced kidney performance. It is an outcome category, not a diagnosis or a general symptom such as feeling unwell.

Kidney Function Decrease is categorized as a health effect.

These are research findings, not promises. Most options have little evidence, and results differ from person to person.

What can cause it

How likely each one is to cause it, most likely first.

  • Chelation Therapy (Non-Medical)practicePossible

    Based on 2 studies. Strongest study: a systematic review of studies.

    A systematic review pooling randomized trials in people with coronary artery disease or peripheral artery disease reported increased creatinine, described as kidney toxicity.

    Open the Chelation Therapy (Non-Medical) page
  • ChagasupplementPossible

    Based on 5 studies. Strongest study: a single case report. Studied for 16 weeks.

    An acute case of oxalate nephropathy with nephrotic syndrome has been reported after Chaga use.

    Open the Chaga page
  • IV Vitamin DrippracticeUnclear

    Based on one study. Strongest study: a single case report.

    A case report described acute kidney injury requiring dialysis in one person with Chronic Kidney Disease, Dyslipidemia, and Hypothyroidism.

    Open the IV Vitamin Drip page
  • Coffee EnemapracticeUnclear

    Based on one study.

    Severe dehydration or electrolyte disturbance may acutely worsen kidney function, especially in people with pre-existing kidney disease.

    Open the Coffee Enema page
  • CyclingpracticeUnclear

    Based on one study.

    Very long or very hard rides, particularly in heat or when dehydrated, can reduce blood flow to the kidneys and cause a short-term decline in kidney function; this has been observed during ultra-endurance events.

    Open the Cycling page
  • Finnish SaunapracticeUnclear

    Based on one study.

    Open the Finnish Sauna page
  • Hot BathpracticeUnclear

    Based on one study.

    Heat shifts blood flow toward the skin, while sweating causes fluid loss; together, these can reduce kidney blood flow during a bath. Long, very hot baths can cause dehydration and strain the kidneys, according to pharmacology references.

    Open the Hot Bath page
  • Strength TrainingpracticeUnclear

    Based on one study.

    Very hard or unaccustomed sessions can cause muscle breakdown (rhabdomyolysis); the myoglobin released can injure the kidneys.

    Open the Strength Training page

The expert view shows every study, dose protocol and source.

What can cause it

Interventions reported to bring this on9 listed

Highest probability

  1. PracticesChelation Therapy (Non-Medical)CertaintyMediumSourceClinical2 other sources

    A systematic review pooling randomized trials in people with coronary artery disease or peripheral artery disease reported increased creatinine, described as kidney toxicity.

    Who was studied

    • People with a condition
    • Coronary Artery Disease
    • Peripheral Artery Disease

    Study result

    increased creatinine (kidney toxicity)

    Open Chelation Therapy (Non-Medical)
    →
  2. SupplementsChagaCertaintyMediumSourceClinical5 other sources

    An acute case of oxalate nephropathy with nephrotic syndrome has been reported after Chaga use.

    Who was studied

    • People with a condition
    • Acute Kidney Injury
    • Chronic Kidney Disease

    Dose & course

    16 weeks

    Study result

    Acute kidney injury with calcium oxalate crystal deposition and nephrotic syndrome features

    Open Chaga
    →
Low probability(7)
  1. PracticesIV Vitamin DripCertaintyLowSourceClinical1 other source

    A case report described acute kidney injury requiring dialysis in one person with Chronic Kidney Disease, Dyslipidemia, and Hypothyroidism.

    Who was studied

    • People with a condition
    • Chronic Kidney Disease
    • Dyslipidemia
    • Hypothyroidism

    Study result

    Acute kidney injury requiring dialysis

    Open IV Vitamin Drip
    →
  2. PracticesCoffee EnemaCertaintyLowSourceReference knowledge1 other source

    Severe dehydration or electrolyte disturbance may acutely worsen kidney function, especially in people with pre-existing kidney disease.

    Study result

    Severe dehydration or electrolyte disturbance can precipitate acute worsening of kidney function, especially in people with pre-existing renal disease.

    Open Coffee Enema
    →
  3. PracticesCyclingCertaintyLowSourceReference knowledge1 other source

    Very long or very hard rides, particularly in heat or when dehydrated, can reduce blood flow to the kidneys and cause a short-term decline in kidney function; this has been observed during ultra-endurance events.

    Study result

    Very long or very hard rides, especially when dehydrated or in heat, cut blood flow to the kidneys and can cause a short-term drop in kidney function, as seen in ultra-endurance events.

    Open Cycling
    →
  4. PracticesFinnish SaunaCertaintyLowSourceReference knowledge1 other source

    Severe dehydration from prolonged or frequent sauna use without rehydration can reduce renal perfusion and temporarily impair kidney function.

    →
  5. PracticesHot BathCertaintyLowSourceReference knowledge1 other source

    Heat shifts blood flow toward the skin, while sweating causes fluid loss; together, these can reduce kidney blood flow during a bath. Long, very hot baths can cause dehydration and strain the kidneys, according to pharmacology references.

    Study result

    Heat moves blood flow to the skin and sweating loses fluid, so kidney blood flow falls during the bath; long, very hot baths can dehydrate and strain the kidneys.

    Open Hot Bath
    →
  6. PracticesStrength TrainingCertaintyLowSourceReference knowledge1 other source

    Very hard or unaccustomed sessions can cause muscle breakdown (rhabdomyolysis); the myoglobin released can injure the kidneys.

    Study result

    Very hard or unaccustomed sessions can cause muscle breakdown (rhabdomyolysis), and the myoglobin it releases can injure the kidneys.

    Open Strength Training
    →
  7. PracticesFastingCertaintyLowSourceReview1 other source

    A 2026 review described increased serum creatinine in clinical populations that included people with cancer, fatty liver, and viral hepatitis; it did not quantify the change.

    Who was studied

    • People with a condition
    • Cancer
    • Fatty Liver Nafld
    • Hepatitis Viral

    Study result

    Increased serum creatinine

    Open Fasting
    →
How to read the evidence

Evidence tier — overall strength of the evidence for the whole compound

  • StrongWell established — backed by strong, consistent human research.
  • ModerateSome genuine support, but mostly from small or lower-quality studies. Promising, not proven.
  • PreliminaryEarly-stage evidence — a promising hypothesis, not an established effect yet.
  • LimitedVery limited evidence — treat this as a hypothesis, not proof.
  • InsufficientNot enough good evidence to draw conclusions yet.

Certainty — how sure we can be that the effect is real

  • Very highVery sure — strong, consistent evidence
  • HighFairly sure — consistent evidence from good studies
  • MediumModerately sure — new studies could change this
  • LowNot sure — little or mixed evidence
  • Very lowVery unsure — almost no usable evidence

Source — where the data comes from

  • Meta-analysisPooled analysis of many trials — the strongest evidence
  • RCTRandomized controlled trial — a strong human study design
  • ClinicalA human clinical study
  • Reference knowledgeFrom general health-science or pharmacology references, not a study of this exact claim
  • Animal researchStudied in animals, not humans
  • Community reportsAggregated user reports — anecdotal signal, not evidence
  • TheoreticalMechanism-based reasoning, not yet tested

Study grade — quality of each underlying study (A best, D weakest)

  • AHigh-quality — strong, consistent human trials
  • BGood — solid evidence with some limitations
  • CModerate — limited, small, or mixed-quality studies
  • DWeak — preliminary, indirect, or animal-only

Confidence — how strongly the sources back a finding

A 0–100 score from study quality and agreement

Most supplement evidence is graded C–D. Read it as preliminary signal, not proof.

Full write-up

What is it

Kidney Function Decrease is an adverse health effect referring to reduced kidney performance. It is an outcome category, not a diagnosis or a general symptom such as feeling unwell. Associations with interventions such as Vitamin C and Ginkgo Biloba should not be interpreted as proof that the outcome will occur in every person who uses them.

How interventions help

These interventions are not shown as helping Kidney Function Decrease; they are linked to findings consistent with worsening kidney function. The reported changes span acute oxalate nephropathy, renal dysfunction, renal failure, acute kidney injury, lower eGFR, increased serum urea nitrogen, increased serum creatinine, and nephrotoxicity. This range suggests that the reported outcome does not arise through one uniform pattern across all interventions, and the findings should not be treated as interchangeable measures.

Timing and exposure vary. Ginkgo Biloba was associated with elevated BUN concentration at Day 30, while a Chaga report involved acute oxalate nephropathy with nephrotic syndrome after 16 weeks at 3844.8 mg/kg (HD). Quercetin-related nephrotoxicity was reported at high intravenous doses >945 mg/m². A separate report described acute kidney injury requiring dialysis after short-term use of concentrated Black Seed Oil tablets. Saffron Extract findings involved increased serum urea nitrogen and kidney histopathology changes in neonate mice, so they do not directly establish the same effect in people. Other reports describe changes such as lower eGFR or worsening kidney function without a shared duration or exposure pattern. Overall, the findings include both human reports and an animal finding, with some tied to specific doses or time periods and others not.

Choosing guidance

These options are not directly comparable because the kidney-related findings arise from different types of evidence. Some are supported by clinical evidence, while others rely on pharmacology references, anecdotal reports, or findings in animals. Animal findings and community reports do not show whether the same effect occurs in people using ordinary products, and case reports cannot establish how often an effect occurs.

The circumstances also matter. Reported concerns include acute oxalate nephropathy, dehydration or electrolyte disturbance, toxicity from excessive exposure, and injury associated with contaminated or concentrated products. This means the amount taken, product formulation, duration of use, and hydration status can be more informative than the option’s name alone. Findings tied to high exposure or a single unusual case should not automatically be treated as evidence of an expected effect at routine use.

For readers seeking evidence most relevant to people, clinical studies are more applicable than animal findings or anecdotal reports, but the studied health status is not specified for these options. People with pre-existing renal disease warrant particular caution around options linked to dehydration or electrolyte disturbance, including Coffee Enema and Finnish Sauna. A separate issue is interpretability: the Astragalus entry reports a finding pointing toward lower rather than higher risk, so it should not be interpreted in the same way as reports describing kidney injury. Overall, choosing among these options requires matching the evidence type and exposure circumstances to the intended use, rather than treating every listed association as equivalent.

Diatelos provides general wellness information based on published research. It is not medical advice. Talk to a clinician before starting any new supplement or practice, especially if you have a health condition, are pregnant, or take medication.