Fosfor Tonic - FosFor Syrup (200ml). Fosfor tonic ingredients: Phosphorylcolamine is an amino acid complex occurring naturally in many body tissues.. What is phosphorylcolamine?  It is required in the body as a substrate in the synthesis of phosphorus and nitrogen to the body as essential dietary supplements.. Fosfor tonic benefits: contains phosphorylcolamine, provides a supplementary source of this amino acid complex in order for the body to naturally replenish its phosphorus and nitrogen levels.