Marcus Chen is a senior e-liquid formulation chemist who holds a Master's degree in Pharmaceutical Chemistry from King's College London and previously worked in pharmaceutical quality assurance before joining the vaping industry in 2012. He has developed over 500 commercial e-liquid recipes for major UK brands and oversees ISO-certified laboratory testing protocols. He currently serves as Quality Assurance Director for a leading British e-liquid manufacturer while consulting on TPD compliance.
Marcus Chen obtained his undergraduate degree in Chemistry from Imperial College London before completing a Master's in Pharmaceutical Chemistry at King's College London, where his research examined flavour compound stability in inhalable formulations. He began his career in pharmaceutical manufacturing, spending four years ensuring Good Manufacturing Practice (GMP) compliance for a major drug company, an experience that shaped his rigorous approach to e-liquid production. Marcus transitioned to the vaping industry in 2012, recognising the opportunity to apply pharmaceutical-grade standards to an emerging consumer products sector. He has since formulated hundreds of e-liquid recipes, mastering the precise balance of propylene glycol, vegetable glycerine, nicotine, and flavour concentrates that create satisfying vaping experiences. His expertise extends to understanding how different flavour molecules interact with coil materials, why certain sweeteners accelerate coil degradation, and how steeping time affects flavour development at the molecular level. Marcus oversees laboratory testing that verifies nicotine concentration accuracy, screens for contaminants, and ensures batch consistency across production runs. He is passionate about educating consumers on reading e-liquid labels, understanding ingredient quality differences, and recognising the markers of properly tested products. His writing draws on both pharmaceutical rigour and practical formulation experience to help vapers make informed choices about what they inhale.