Why Complex? | Science-Backed Supplements

Why We Built Complex

We started with a simple idea - to combine elite athletic performance and modern science into supplements that actually work. We founded Complex in Prague in 2023 (Sebastian Rod, Filip Langer, and Honza Tobiška) because we were tired of a market full of compromises, confusing jargon, and empty promises.

Our goal is to deliver uncompromising quality with science-backed formulations for anyone who wants to push their limits — from elite athletes and entrepreneurs to everyone who wants to live life to the fullest.

How We Build Every Product

We were looking for supplements we could truly trust, but none of them convinced us. So we made our own. From day one, we’ve built Complex on what actually makes sense: top-tier quality, science-backed formulas, and an approach that isn’t just marketing - it genuinely works.

We create every product with one goal: to help you feel better, look better, and perform better. Today, our supplements are used by professional athletes, entrepreneurs, students, and anyone who wants to get the most out of themselves.

That's why every Complex formula is built on evidence-based, full research-backed dosing - never underdosed to pad a label. We use premium branded ingredients where they matter, like KSM-66® ashwagandha, hold our creatine to Informed Sport certification so athletes know every batch is tested clean and free of banned substances, and manufacture everything in the European Union under strict EU quality and testing standards.

The range is built to cover what active people actually need across the day: creatine and pre-workout for training, electrolytes and dual-carb hydration for endurance, magnesium for better sleep and recovery, a daily multivitamin and omega-3 for everyday health, and joint care to keep you moving. Performance, recovery, focus, immunity - clean formulas, transparent labels, and doses that genuinely work, trusted by professional athletes and anyone serious about getting more out of their body.

Our development process

Research

Step 1: Research & brief

Every product starts with the “why”: the real problem we’re solving and the result you should notice. We define the use case (training, recovery, sleep, focus), set clear expectations, and build a benefit map that’s realistic and compliant - so the product earns trust through consistency, not hype.

Formulation

Step 2: Formulation & sourcing

We select evidence-backed ingredients in forms that make sense, then design doses around real-world use (timing, serving size, tolerance). In parallel, we validate sourcing and specs - because a great formula is only as good as the quality and repeatability behind it.

Sampling

Step 3: Sampling & testing

We run multiple sample rounds and refine what actually impacts your experience: dosing feel, mixability, taste/texture, and tolerability. We iterate until it’s not just “effective on paper,” but something you can take daily without friction.

Quality

Step 4: Quality control

Before production, we review label text, specifications, and documentation to ensure everything is accurate, transparent, and defensible. No vague claims - just clear information you can rely on.

Launch

Step 5: Launch-ready

Only after final checks do we approve a full batch. The product is manufactured to spec, verified through QC, and released only when it matches what we signed off on.

Iteration

Step 6: Constant Iteration

Launch is feedback. We track reviews and real usage, then make steady improvements - better taste, cleaner dosing, clearer instructions, tighter specs - while keeping the product consistent and reliable over time.

Our Founders

Sebastian Rod - CEO

Sebastian Rod is the co-founder and CEO of Complex. He has led the brand's strategy, growth, and direction from day one - and built it into one of the most trusted names in Czech sports nutrition.

Sebastian started building businesses while still at university, launching several ventures before he graduated. Those early wins taught him how to build something from nothing. He brought that experience into Complex, growing it from zero to more than €2.8 million in annual revenue in under three years, with no outside funding - and into a brand now trusted by professional athletes, entrepreneurs, and students alike.

He grew up as a competitive athlete, and sport at a high level taught him discipline, the habit of competing, and the drive to keep pushing when it would be easier to stop. He still trains seriously today, and he leads the company the same way he competes: focused on performance, honest about the work, and never satisfied with standing still.

That mindset shapes how he leads Complex - performance over hype, long-term thinking over quick wins, and an unrelenting focus on staying one step ahead. His vision is simple and deliberately oversized: to build Complex into the biggest supplement brand in the world.

Filip Langer - Logistics

Filip Langer is a professional floorball player competing in Sweden’s top league (SSL) and a member of the Czech national team. Alongside co-founding Complex, he connects elite sport with the world of business. His goal is for the brand to be a partner for anyone who wants to become the best version of themselves.

On the field and beyond, he builds on discipline, science-backed strategies, and authenticity. At Complex, he oversees logistics and, as a content creator, inspires a broad audience — from professional athletes to anyone looking to take their performance to the next level.

Honza Tobiška - Product

Honza Tobiška is the co-founder and Product Manager at Complex. He’s also a respected science-based lifestyle coach who works with elite athletes from the NHL, the Premier League, the Bundesliga, and the top Czech league. His clients include Patrik Schick, Antonín Kinský, Jiří Kulich, and David Jiříček.

As the youngest member of the renowned STACA institute, he provides comprehensive guidance in nutrition, sleep, supplementation, and recovery. Sport has been part of his life since childhood—intensive training in football and judo sparked his passion for performance optimization as early as sixteen.

Today, Honza reaches tens of thousands of people through social media, teaching them how to combine the latest scientific insights with simple, practical habits. His goal is simple: to help anyone take their performance and lifestyle to the next level.

Our story