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FlexJoint Advanced

Evidence grade: B (80/100)

The score (0–100) is a sample-size-weighted average of each ingredient's strongest study, where study quality is ranked RCT(4) > cohort(3) > case(2) > preclinical(1) and bigger samples count more (with diminishing returns). Bands: A ≥85, B ≥70, C ≥55, D ≥40, else F. Ingredients with no study are excluded — an absent study is never scored as “bad.”

Weighted aggregate of each ingredient's strongest evidence (study quality × sample size). 4 ingredients.

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Evidence at a glance

These are simple counts rolled up from the studies below. They describe how much evidence exists and how strong it is — not whether the product works. Ingredients with no indexed study are reported as insufficient, never scored as “bad.”

4Ingredients evidenced

Ingredients with at least one gradeable study.

5Studies cited

Every gradeable study record in the curated ledger behind this product. Predatory / non-indexed sources are excluded by design.

2,794Participants

Total human sample size (n) summed across the cited studies. Bigger totals mean more people were studied — a rough measure of evidence weight, not of effectiveness.

RCTStrongest study

The highest-quality study design present anywhere in this product's evidence: Randomized controlled trial. The quality ladder is RCT > cohort > case > preclinical.

Study mix:RCT: 2Cohort: 1Case: 2Preclinical: 0

Per-ingredient evidence

Studies are ordered strongest-first. Study quality is ranked RCT > cohort > case > preclinical; ties go to the larger sample size (n). An ingredient with no indexed study is marked Insufficient — never scored as “bad.”

5 studies shown

Glucosamine HCl

Strongest evidence: Randomized controlled trial, n=1,583

RCT

Grade	n	Study	Finding
RCT	1,583	Glucosamine, Chondroitin, or the Two in Combination for Knee OA (GAIT)NEJM · 2026-01-12	No significant overall pain reduction vs placebo; possible benefit in moderate-to-severe subgroup.
Cohort	414	Glucosamine sulfate use and delay of progression of knee OAArch Intern Med · 2026-01-12	Long-term use associated with reduced joint-space narrowing over 3 years.

Chondroitin Sulfate

Strongest evidence: Randomized controlled trial, n=604

RCT

Grade	n	Study	Finding
RCT	604	Chondroitin sulfate vs celecoxib for knee OA (MOVES randomized trial)Ann Rheum Dis · 2026-01-12	Non-inferior to celecoxib for pain and function over 6 months.

MSM (Methylsulfonylmethane)

Strongest evidence: Case series / small trial, n=118

Case

Grade	n	Study	Finding
Case	118	MSM for osteoarthritis pain: a pilot clinical trialOsteoarthritis Cartilage · 2026-01-12	Small improvement in pain and physical function vs placebo; pilot scale.

Boswellia Serrata

Strongest evidence: Case series / small trial, n=75

Case

Grade	n	Study	Finding
Case	75	Boswellia extract in osteoarthritis of the kneePhytomedicine · 2026-03-18	Reported pain/function improvement; short duration, small sample.

Ask AI

AI can be wrong. Not medical, legal, or financial advice.

Not medical advice. Grades reflect the quality and quantity of published evidence for an ingredient — not a health claim, endorsement, or guarantee of effect. An absent study is reported as insufficient, never as proof a thing does or does not work. Talk to a clinician before changing any regimen.