# Why Stacking Curcumin or Astaxanthin With Workouts Isn't Proven Yet

_Evidence Level: Preliminary · Traustadóttir T et al., Free radical biology & medicine, DOI 10.1016/j.freeradbiomed.2026.08.040_

*Exercise and phytochemicals as modulators of redox homeostasis in aging.*

- **Evidence Level**: Preliminary
- **Why this grade**: Narrative review of exercise and Nrf2-activating phytochemicals, with the evidence drawn largely from cell and rodent studies and little clinical data in older adults.
- **Facts**: Design: Review · Funding: The authors declare no conflict of interest.
- **Publication Types**: Journal Article, Review
- **Journal**: Free radical biology & medicine
- **Sample Size**: N/A (review)
- **Authors**: Traustadóttir T, Islam H, Ostrom EL
- **Graded and published**: 2026-08-19
- **Last edited**: 2026-09-17
- **Topics**: Astaxanthin, Curcumin, Exercise, Oxidative Stress
- **DOI**: https://doi.org/10.1016/j.freeradbiomed.2026.08.040
- **Original Source**: https://pubmed.ncbi.nlm.nih.gov/42617706/

## Summary

Exercise flips on Nrf2, a master switch that helps cells handle oxidative stress. That switch gets sluggish with age, which is why some people pair training with plant compounds like astaxanthin, curcumin or sulforaphane. This review found the idea makes sense on paper, but most supporting data comes from cells and rodents. Human trials in older adults are still too thin to say the combo beats exercise alone.

## Practical Takeaway

This review suggests the exercise-plus-phytochemical combo remains an open question, not a proven strategy.

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_Canonical: https://longevity-germany.com/en/research/why-stacking-curcumin-or-astaxanthin-with-workouts-isn-t-proven-yet · Part of Longevity Cities · Updated 2026-09-17_