# Helmut Sies

**Type:** Researchers  
**Canonical URL:** https://scholariq.org/researchers/helmut-sies/

## Facts

| Field | Value |
| --- | --- |
| Citations | 106,825 |
| Field | Antioxidant Activity and Oxidative Stress |
| h-index | 150 |
| i10-index | 603 |
| Last Known Institution | Leibniz Institute of Environmental Medicine |
| OpenAlex ID | https://openalex.org/A5091525666 |
| ORCID iD | https://orcid.org/0000-0002-1000-3198 |
| Works | 862 |

## Researcher papers

- [Reactive oxygen species (ROS) as pleiotropic physiological signalling agents](https://scholariq.org/papers/reactive-oxygen-species-ros-as-pleiotropic-physiological-signalling-agents/)
- [Oxidative Stress](https://scholariq.org/papers/oxidative-stress/)
- [Lycopene as the most efficient biological carotenoid singlet oxygen quencher](https://scholariq.org/papers/lycopene-as-the-most-efficient-biological-carotenoid-singlet-oxygen-quencher/)
- [Defining roles of specific reactive oxygen species (ROS) in cell biology and physiology](https://scholariq.org/papers/defining-roles-of-specific-reactive-oxygen-species-ros-in-cell-biology-and/)
- [(–)-Epicatechin mediates beneficial effects of flavanol-rich cocoa on vascular function in humans](https://scholariq.org/papers/epicatechin-mediates-beneficial-effects-of-flavanol-rich-cocoa-on-vascular/)
- [Antioxidant defense systems: the role of carotenoids, tocopherols, and thiols](https://scholariq.org/papers/antioxidant-defense-systems-the-role-of-carotenoids-tocopherols-and-thiols/)
- [Vitamin E in Humans: Demand and Delivery](https://scholariq.org/papers/vitamin-e-in-humans-demand-and-delivery/)
- [The Biological Relevance of Direct Antioxidant Effects of Polyphenols for Cardiovascular Health in Humans Is Not Established1–4](https://scholariq.org/papers/the-biological-relevance-of-direct-antioxidant-effects-of-polyphenols-for/)
- [Acute Consumption of Flavanol-Rich Cocoa and the Reversal of Endothelial Dysfunction in Smokers](https://scholariq.org/papers/acute-consumption-of-flavanol-rich-cocoa-and-the-reversal-of-endothelial/)
- [Plasma antioxidants and longevity: a study on healthy centenarians](https://scholariq.org/papers/plasma-antioxidants-and-longevity-a-study-on-healthy-centenarians/)
- [Vitamins E and C are safe across a broad range of intakes1,2](https://scholariq.org/papers/vitamins-e-and-c-are-safe-across-a-broad-range-of-intakes1-2/)
- [Cocoa polyphenols and inflammatory mediators](https://scholariq.org/papers/cocoa-polyphenols-and-inflammatory-mediators/)

## Researcher topics

- [Antioxidant Activity and Oxidative Stress](https://scholariq.org/topics/antioxidant-activity-and-oxidative-stress/)
- [Free Radicals and Antioxidants](https://scholariq.org/topics/free-radicals-and-antioxidants/)
- [Redox biology and oxidative stress](https://scholariq.org/topics/redox-biology-and-oxidative-stress/)
- [Sulfur Compounds in Biology](https://scholariq.org/topics/sulfur-compounds-in-biology/)
- [Selenium in Biological Systems](https://scholariq.org/topics/selenium-in-biological-systems/)

## Researcher university

- [Leibniz Institute of Environmental Medicine](https://scholariq.org/institutions/leibniz-institute-of-environmental-medicine/)

---
Source: ScholarIQ — public research metadata, principally OpenAlex. See https://scholariq.org/sources/ for provenance and https://scholariq.org/methodology/ for what these figures mean.