In a large mixing bowl, whisk together melted coconut oil and honey. Mix in eggs, vanilla, salt, milk and zucchini until well combined. Fold in collagen, protein powder, baking soda, cinnamon, nutmeg and flour.
Spray a 9X5-inch bread pan with nonstick cooking spray and pour in batter. Mix together remaining cinnamon and Truvia and sprinkle on top.
Bake for 50-55 minutes, or until golden brown on top and set in the center. Cut into slices and serve.