This was covered in a long thread in the past.
Just take BCAAs + EAAs pre workout and profit.
BPI is not selling 'Silk Amino Acids', or at least, they're not selling the protein that was studied.
Sericin (The silk protein you're looking for) is a peptide which follows the amino acid sequence: SSTGS SSNTD SNSNS AGSST TYGYS SNSRD GSV
The BPI product is simply bulk Alanine, Glycine, Serine, Valine, and Threonine.
This one time De__eB became an SNS Representative
DeeB @ seriousnutritionsolutions dot com
I wouldnt spend the money on them but unlike a lot of "BS" supplements if someone gave me some Blox i would have no problem using them, best Amino Acid supplement taste wise out there imo.
Anything BPI is a joke.