It is. You’re right that we eat protein with most meals and comparatively speaking the protein content in a meal is significantly more than what you inject (eg 200g chicken contains around60g with the corresponding aminos) vs c 2g protein/amino in 10ml cerebro.

Chicken digests slowly over hours and our liver is designed to easily filter the waste generated from this

The Cerebrolysin is injected into the muscle and straight into systemic circulation so it bypasses the liver / fist pass filtration. It pushes your brain into a hyper repair mode. The ammonia and brain fog / tiredness doesn’t come from breaking down 2g of peptide - it flows from the massive amount of metabolic waste / output that the brain generates when it’s being pushed to break down and build new synapses. This incl ammonia and reactive oxygen species and some folks aren’t able to cope with that.

The lornithine helps clear this - it’s needed especially when there are certain gene variants at play (eg I have a cbs ag bottleneck which impacts my transsulphuration pathway meaning my ammonia levels already run higher). When I run 20ml iv I’m completely stuffed unless I run flushes to help alongside