Vital Proteins, the top collagen brand in the U.S., acquired by Nestlé in 2021, pioneered a new consumption scene by "snackifying" collagen products and driving engagement through an influencer-content approach. Active on Instagram and TikTok, the brand focuses on Key Opinion Consumers (KOCs) with 2,000 to 5,000 followers, achieving interaction rates of 25% to 40%. How can Vital Proteins' social media marketing model inform outbound brands, and what lessons might it bring to social media marketing in China?