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Open WellbeingWhat the studies actually measured

Joints, muscles and pain

5-HTPand Pain intensity

Only one source here so far, and it found no clear difference in pain intensity.

How sure anyone can be

Low certainty, level 2 of 4

Further research is likely to change this.

The numbers reported

One source’s range, drawn against its own line of no difference and scaled to its own numbers.

-14.44-4.176.1

This range crosses the no-difference line, so these numbers fit a real difference and no difference at all equally well.

Bar the confidence interval — the range the true effect is likely to sit inNotch the number the source reportedLine where there would be no difference at all

One source, newest first

What we read is the published abstract, not the full paper, so a blank below may still be printed in the paper itself. A fixed rule worked this out from the source’s own fields. Nobody checked this rating by hand.

  • Randomised trial, 2026 · 18 participants

    Low certainty, level 2 of 4

    The Effect of Griffonia simplicifolia on Pain Intensity, Central and Peripheral Sensitization, and Pain Modulation in Healthy Volunteers-A Randomized, Double-Blinded, Placebo-Controlled Crossover Trial.

    Nutrients. 2026;18(10). doi:10.3390/nu18101609. PMID:42197069.

    Number reported
    -4.17
    Which way it went
    No clear difference
    Likely range
    -14.44 to 6.1
    Source’s own words
    regression coefficient for acute pain perception after repetitive phasic heat application vs placebo
    Who was studied
    Adult
    Compared with
    placebo
    Amount taken
    100 mg/d Griffonia simplicifolia (5-HTP source)
    For how long
    28 days
    Disagreement between studies
    Not in the abstract
    Kind of record
    Journal article
    How this rating was reachedstarts at High, 2 steps down: risk of bias and imprecision
    1. Starts at High
    2. Risk of bias brought it down to Moderatethe abstract reports no risk-of-bias or quality appraisal, so study limitations cannot be ruled outNot in the abstract
    3. Imprecision brought it down to Lowthe confidence interval includes no effectReported in the abstract
    4. Ends at Low2 steps down.
    Checked, nothing to step it down for
    indirectness
    Inconsistency
    One study, so there was nothing to disagree

    Imprecision stops at the first check that applies; others may apply too.

    AI-reviewed & signed — an AI agent re-read this finding against the saved source and checked that the quote, the numbers, the units and the direction match it. No person read it. The owner authorised the agent to sign the batch with the owner's key, and every build rechecks that signature against these exact bytes.

    Read the abstract on PubMed

What is still missing from these readings

Every reading here records a range, a count of people, an amount and a length of time.

Something nobody wrote down is never a zero and never a guess.

Still to read for 5-HTP

Five of the 15 things on our list for 5-HTP have no reading here yet:

  • Cognitive performance
  • Migraine frequency
  • Migraine intensity
  • Salivary cortisol
  • Sleep quality (subjective)

Still to read means nobody here has got to it, not that it was tried and did nothing or that no research exists. A pairing on no list is not a gap: we never set out to read it.

Read next

  • 5-HTP

    Nine other questions read for it

  • Joints, muscles and pain

    18 questions read under it

  • Pain intensity

    No other ingredients read against it

    Alphabetical, and by nothing else.

This is a library, not advice. No recommendation, no dose, no diagnosis, no ranking. We never ask about your symptoms, and nothing here is tailored to you.