Advertised as a dietary supplement meant to fill the gaps determined by an improper daily diet of stressed or busy people, Catalyn is a multivitamin blend combined with some animal and plant extracts meant to improve vitamin absorption. Reported client effects include help with treatment and prevention of colds and sinus infections as well as raised energy levels for everyday activities. It is often regarded as a side-effect free supplement, but only if the label dosages are followed accordingly. High dosages of this supplement may determine unwanted effects, and the treatment should be immediately stopped if any of them occurs.