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Recovery & HRV

Curcumin

Curcuminoid extract standardised to ≥95% curcuminoids, in a bioavailable delivery form (phytosome/Meriva, Theracurmin, Longvida) or co-dosed with 20 mg piperine

StrongReal effect, but below wearable noise
4
sources
25
trials
349
participants (largest study)
3
study designs
The verdict

Cuts post-exercise soreness (WMD −0.56 VAS points, 95% CI −0.84 to −0.27) and creatine kinase (−137 U/L, 95% CI −239 to −36), and adds ~4.1° of range of motion (95% CI 1.45 to 6.75).

Why this grade
Emerging
Preliminary or mechanistic
Moderate
Some RCTs, limited replication
Strong
Multiple RCTs or meta-analyses, consistent direction

Two independent meta-analyses (10 RCTs, 2022; 14 RCTs / 349 subjects, 2024) agree in direction and magnitude on soreness, CK and ROM. Downgraded only by small trials and heterogeneous formulations — not enough to drop below strong.

How it works

Inhibits NF-κB and COX-2 signalling, blunting the IL-6/TNF-α cascade that drives secondary damage after eccentric work; free curcumin is poorly absorbed, so piperine (CYP/UGT inhibition) or a lipid/phytosome carrier is required.

Who it helps, and who it doesn't

Untrained or returning athletes and anyone doing unaccustomed eccentric work show the largest effect; the meta-analysis found benefit concentrated in untrained subjects and in supplementation runs longer than one week.

Measured effects (absolute, from the trials)

Every estimate, against a line of no effect

Diamonds are point estimates; the hairline is the 95% confidence interval where the trial reported one.

  • Muscle soreness (VAS)
    VAS points (0–10) · Fang & Nasir, PLOS ONE 2024
    −0.61
    −0.81 … −0.41
−0.50NO EFFECT
Separate scale · U/L
  • Creatine kinase
    U/L · Fang & Nasir, PLOS ONE 2024
    −137.3
    −238.8 … −35.8
−200−1000NO EFFECT
Separate scale · degrees
  • Range of motion
    degrees · Fang & Nasir, PLOS ONE 2024
    +4.10
    +1.45 … +6.75
0+3+5+8NO EFFECT
Separate scale · pg/mL
  • Interleukin-6
    pg/mL · Fang & Nasir, PLOS ONE 2024
    −0.33
    −0.56 … −0.09
−0.6−0.4−0.20NO EFFECT

Units are never mixed on one line: each scale gets its own axis. Where a trial reported no confidence interval we leave it blank rather than inventing one.

Studies over time

4 studies across 26 years

1998 — 2024
19982005201120182024
Meta-analysis or systematic reviewRandomized or crossover trialObservational or preliminaryHover a marker for detail
Dose
500–1500 mg/day curcuminoids; meta-analysis found doses <500 mg/day worked as well or better than >1.5 g/day
Timing
Split into 2 doses with fat-containing meals; start 2–7 days before a hard block and continue 3–4 days after. Pre-exercise dosing favours soreness/ROM, post-exercise favours CK and IL-6.
Safety flags
  • · Diarrhoea, nausea and abdominal distension at doses above ~1.5 g/day
  • · Drug-induced liver injury is documented: 10 DILIN cases, 1 fatal; 7 of 10 carried HLA-B*35:01 and piperine-containing products were implicated
  • · Increases oxalate excretion — avoid with a history of calcium-oxalate kidney stones
Where to buyRecord what I'm taking

References

  1. 1.
    The effect of curcumin supplementation on delayed-onset muscle soreness, inflammation, muscle strength, and joint flexibility: A systematic review and dose–response meta-analysis of randomized controlled trials
    Phytotherapy Research · 2022 · meta-analysis · 10 trials

    Soreness WMD −0.56 (95% CI −0.84 to −0.27), CK −65.98 IU/L (−99.53 to −32.44), TNF-α −0.22 pg/mL (−0.33 to −0.10), MVC +3.10 Nm, ROM +6.49°.

  2. 2.
    Meta-analysis of the effect of curcumin supplementation on skeletal muscle damage status
    PLOS ONE · 2024 · meta-analysis · 14 trials · n = 349

    Soreness MD −0.61 (−0.81 to −0.41), CK −137.32 (−238.82 to −35.82), IL-6 −0.33 (−0.56 to −0.09), ROM +4.10 (1.45 to 6.75); doses <0.5 g/day outperformed >1.5 g/day.

  3. 3.
    Influence of piperine on the pharmacokinetics of curcumin in animals and human volunteers
    Planta Medica · 1998 · crossover · 1 trials · n = 10

    2 g curcumin with 20 mg piperine raised curcumin bioavailability by 2000% versus curcumin alone in human volunteers.

  4. 4.
    Liver Injury Associated with Turmeric—A Growing Problem: Ten Cases from the Drug-Induced Liver Injury Network [DILIN]
    The American Journal of Medicine · 2023 · case reports · n = 10

    Ten hepatotoxicity cases, median onset 86 days, 5 hospitalised and 1 death; 7/10 carried HLA-B*35:01 and 3 tested products contained piperine.

Umbral is a wellness product, not a medical device. It does not diagnose, treat, cure or prevent any disease. Supplement information is educational; talk to a clinician before starting anything, especially if you are pregnant, under 18, managing a condition or taking medication.