Serotonin is a performance marketing agency aimed at helping brands improve their performance quickly. Founded by Dom Carter and Clair Heaviside, we have over a decade of experience in growing brands across the UK, Europe, and the US. We avoid jargon, superficial metrics, and lengthy presentations. Instead, we focus on providing clarity, speed, and commercial effectiveness at every stage of the sales funnel. Whether it's forecasting, strategy, paid media, performance creative, or conversion rate optimization (CRO), we guide brands towards their goals more efficiently. Our team has extensive knowledge of platforms such as Meta, Google, TikTok, and Amazon, combined with a creative approach suited for short attention spans. We prioritize the entire customer journey, along with click-through rates, and we know how to translate performance data into actionable insights for brands. We have successfully scaled fashion brands from £5,000 to £100,000 a month, introduced global fitness brands to new markets, and modernized the digital strategies of established names. Whether you are starting from scratch or hitting a revenue plateau, Serotonin provides the momentum you need. We work best with founders, marketers, and CMOs who appreciate straightforward collaboration and tangible results, seeking fewer meetings and more progress. This agency doesn’t create unnecessary noise; instead, it delivers meaningful insights. Serotonin is the performance partner for ambitious brands.