Why professional athletes choose FitLine: safety, quality, results

The standard in professional sport

When athletes compete at the highest level, they cannot afford to take risks with their nutrition. A positive doping test—even from a contaminated supplement—can end a career. That is why safety and independent certification are essential for professional athletes.

FitLine meets this requirement. All FitLine food supplements are listed on the Kölner Liste®—the independent batch-testing programme of the German Sport University Cologne. Products on the Kölner Liste® are regularly tested for substances prohibited in sport and provide athletes and their support teams with reliable guidance.

• Kölner Liste®—official information – Information about the testing programme for food supplements in sport.

Official partner of the ATP Tour

FitLine is the Official Sports Nutrition Partner and Official Energy Bar Partner of the ATP Tour—the world’s leading professional men’s tennis tour. The ATP Tour selected FitLine because of the brand’s extensive experience working with professional athletes and its commitment to clean sport.

Rodolphe Tastet, Vice President Partnerships & Business Development at the ATP Tour, stated: “FitLine has extensive experience working with professional athletes.”

• ATP Tour & FitLine forge global partnership – Official ATP Tour announcement about the partnership with FitLine.

A broad network of sports partnerships

FitLine’s partnerships extend far beyond tennis. The brand is an official supplier to numerous sports federations and national teams, including:

• ATP Tour—Official Sports Nutrition Partner
• German Ice Hockey Federation (DEB)
• German Cycling Federation (BDR)
• Paris Basketball—Official Supporter since December 2025

More than 1,000 elite athletes from over 85 disciplines and 40 countries trust FitLine products as part of their daily routine.

• PM-International—company information – Official information about FitLine and its international sports partnerships.

Made in Germany—GMP quality

FitLine products are manufactured in Germany in accordance with Good Manufacturing Practice (GMP)—the quality standard of the pharmaceutical industry. Regular independent quality tests are carried out by ELAB Analytic GmbH.

This combination of GMP production, independent testing and Kölner Liste® certification gives athletes confidence that what is stated on the label is contained in the product—and nothing else.

The FitLine Optimal Set for athletes

The FitLine Optimal Set provides a structured daily nutrition routine:

• Basics in the morning—vitamins, selenium and fibre for a solid nutrient foundation
• Activize before activity—B vitamins and natural extracts to support energy
• Restorate in the evening—calcium, magnesium and trace elements for overnight recovery

This three-stage system is designed to fit naturally into the demanding everyday lives of professional and recreational athletes.

Research: nutrition and athletic performance

The scientific evidence for targeted micronutrient supplementation in athletes is well established:

• Lukaski (2004)—Vitamin and mineral status: effects on physical performance – Shows that even marginal micronutrient deficiencies can impair athletic performance.
• Maughan et al. (2018)—IOC consensus statement on dietary supplements – International Olympic Committee guidelines on supplement use in elite sport, with a focus on safety and batch testing.
• Rawson et al. (2018)—Dietary supplements for health, adaptation and recovery in athletes – Overview of evidence-based supplementation strategies for competitive athletes.