Answer:
PS is not an essential nutrient, and therefore dietary deficiency do not occur. Adults age 50 and elder, especially those with age-related cognitive decline, may not synthesize satisfactory PS, and appear most likely to benefit from supplemental PS.

Most research have been conducted near PS derived from bovine (cow) brain tissue. Due to concerns about the possibility of humans contracting infectious diseases (such as “mad cow” disease), bovine PS is not available contained by the United States.
The soy- and bovine-derived PS, however, are not structurally identical.

Preliminary animal research shows that the soy-derived PS does hold effects on brain function similar to effects from the bovine source.

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