The Short Version
No peer-reviewed study published by April 2026 directly profiles the microbial community of fermented mealworm frass fertilizer. Existing research characterizes raw mealworm frass or frass from other insects, but fermentation—a process known to shift microbial populations—was not included in those analyses. Therefore, the specific assertion that fermented mealworm frass fertilizer has been scientifically characterized is not supported by the evidence.