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Editorial standards

How Ketalux Rates Evidence

Ketalux attaches an evidence rating to specific claims so readers can see how much confidence the published literature actually supports. This page explains what each rating means.

Written by: Ira ZootMedical review status: Pending clinical reviewLast updated: August 2026Evidence: Editorial methodology
Quick answer
What does a Ketalux evidence rating mean?
An evidence rating describes how much published human research supports one specific claim — not a whole therapy, clinic, or product. Ratings run from strong to not supported, with rating pending used where no assessment has been made yet. Every rating on the site must be backed by sources cited on the same page.
Key takeaways
  • Ratings apply to a single, stated claim — never to an entire treatment or provider.
  • The rating reflects study design, replication, sample size, consistency, and how well limitations are handled.
  • A rating is a snapshot. New trials can raise or lower it, and we revise rather than defend.
  • 'Insufficient evidence' means unknown, not disproven — and not proven.

The scale

Ketalux evidence rating
Example: a claim rated "strong evidence"
Strong evidenceMultiple well-conducted randomized trials, or systematic reviews of them, point in the same direction.
Several well-conducted randomized controlled trials, or systematic reviews and meta-analyses of them, that point in the same direction. Effects have been replicated by independent groups, samples are large enough to be informative, and the finding survives reasonable variation in study design.

Strong does not mean settled or universal. It describes the claim as stated, in the populations studied, over the durations studied.

Ketalux evidence rating
Example: a claim rated "moderate evidence"
Moderate evidenceRandomized or well-controlled data exist, but the body of work is smaller, shorter, or less consistent.
Randomized or well-controlled data exist, but the body of work is smaller, shorter, less replicated, or somewhat inconsistent. Direction of effect is reasonably clear; magnitude and durability are less so.

A single additional well-powered trial could meaningfully shift this rating.

Ketalux evidence rating
Example: a claim rated "preliminary evidence"
Preliminary evidenceEarly-phase trials, small samples, open-label work, or observational data only.
Early-phase trials, small samples, open-label work, case series, or observational data only. Findings are interesting but have not been tested against the biases that controlled designs are meant to remove.

Preliminary results frequently shrink or disappear in larger controlled trials. Treat as a hypothesis, not a conclusion.

Ketalux evidence rating
Example: a claim rated "mixed evidence"
Mixed evidenceCredible studies disagree, or results depend heavily on study design.
Credible studies disagree, or results depend heavily on population, dose, comparator, outcome measure, or blinding quality.

Mixed is a real finding, not a placeholder. It usually means the honest answer is 'it depends', and the page should say what it depends on.

Ketalux evidence rating
Example: a claim rated "insufficient evidence"
Insufficient evidenceNot enough published human data to support a conclusion in either direction.
Not enough published human data to support a conclusion in either direction. There may be mechanism work, animal data, or clinical anecdote, but not enough clinical research to rate.

Insufficient evidence is not evidence of absence, and it is not evidence of benefit.

Ketalux evidence rating
Example: a claim rated "not supported"
Not supportedAvailable evidence does not support the claim, or contradicts it.
The available evidence does not support the claim, or contradicts it. This rating is used sparingly and always with citations.

Applies to the specific claim wording, not to an entire therapy or provider.

Ketalux evidence rating
Example: a claim rated "rating pending"
Rating pendingNo Ketalux evidence rating has been assigned yet.
No Ketalux evidence rating has been assigned yet, usually because the claim has not been through source review.

Unrated content should be read as general background, not as a graded conclusion.

What we weigh when assigning a rating

  • Study design. Randomized, blinded, controlled work carries more weight than open-label or observational work, which in turn carries more weight than case reports, mechanism studies, or animal data.
  • Replication. One striking result is a lead. The same result from independent groups is evidence.
  • Sample size and power. Small trials produce unstable effect estimates and are more likely to overstate benefit.
  • Consistency. Whether findings hold across populations, doses, delivery routes, comparators, and outcome measures.
  • Limitations and bias. Functional unblinding (a well-known problem in ketamine trials), short follow-up, industry sponsorship, selective outcome reporting, and high dropout all reduce confidence.
  • Uncertainty. Where the literature is genuinely unresolved, the page should say so rather than round toward a cleaner answer.

Ratings apply to claims, not to therapies or providers

"Ketamine works" is not a claim we rate, because it is not specific enough to test. "A single IV ketamine infusion reduces depressive symptoms within 24 hours in adults with treatment-resistant depression" is. The same therapy can carry a strong rating for one claim, a preliminary rating for another, and insufficient for a third. We never assign ratings to clinics, providers, brands, or products.

Ratings change

An evidence rating is a snapshot of a moving literature. When new trials, systematic reviews, or regulatory findings change the picture, the rating changes with them and the page's last-updated date is revised. Ratings are assigned editorially, without input from advertisers, sponsors, or listed providers — see editorial independence.

Related

About the author
Ira Zoot

Independent publisher and editor of Ketalux, based in Chicago, Illinois. Ira commissions, edits, and reviews every article on the site and believes ketamine therapy — used responsibly — offers real hope for people living with depression, anxiety, PTSD, and chronic pain. Contact: ira@idigits.com.

Educational use only. The content on this page is provided for general educational purposes and does not constitute medical advice, diagnosis, or treatment. Ketamine and related therapies carry risks and are appropriate only under qualified medical supervision. Always consult a licensed healthcare professional about your individual situation. Information may change as research evolves.