Liza Koshy partnered with Supergoop! for the 'Feel Super' campaign, which features an entertaining series of sun-fueled storytelling. The campaign promotes SPF awareness and highlights products like Glowscreen, Unseen Sunscreen, and PLAY. Koshy's role includes creating 'SuperShades' sunglasses to encourage daily sunscreen use.

Liza Koshy became the first-ever brand ambassador for C'est Moi in August 2019. In October 2020, she launched a capsule collection named 'One of One by C'est Moi', featuring multipurpose products that are EWG VERIFIED™ and designed for sensitive skin.

Liza Koshy collaborated with Fabletics to launch her first activewear collection on January 1, 2021. The collection features streetwear-inspired items like leggings, sports bras, sweatpants, and joggers with a focus on versatility and comfort. Liza emphasized the importance of dressing for comfort, stating, "that's exactly what we created for," reflecting a shared goal of empowerment and confidence.

Liza Koshy released a second limited-edition capsule collection with Fabletics on August 2, 2021. This collection was inspired by nature and urban utility, featuring bodysuits, joggers, hoodies, and more, made with high-tech fabrics and textures. The launch followed the success of her first collection and was based on customer demand.