This site names this specific bonus guide directly: the Renova Flora Protocol, valued at $77.
This site describes it directly as a course on gut microbiota, digestion and nutrient absorption — worth noting this is the one bonus guide among the six that addresses gut health rather than skin, hair or fitness directly.
Worth noting this guide's gut-health focus sits somewhat apart from Gelagen's own skin, hair and nail positioning — a bonus addition rather than a direct extension of the core product's stated purpose.