I strongly agree with what mrsD and DejaVu have said about Sphingolin - i would not touch it with the proverbial barge-pole.

Who knows what you are getting when you consume a product extracted from cattle brains? It could well include the misfolded form of prion protein - I doubt that the sellers of Sphingolin are capable of assessing this.

Misfolded prion protein will kill you - it will (through well-understood biochemistry) convert your normal form of prion protein into its lethal form.

The alleged benefit of Sphingolin is not worth the risk in my opinion.