BPI Sports BLOX Review



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BLOX is a Silk Amino Acid supplement by BPI Sports which contains nothing more than SAAs in precise ratio.


The term “Silk Amino Acids” (SAAs), or Serecin, refers to a group of amino acids (or protein) produced by silkworms, the major constituents of which are: L-Alanine, Glycine, L-Serine, L-Valine (also one of the branched chain amino acids), and L-Threonine (in weights of 34%, 27%, 9%, 3%, and 2% respectively). One serving of BLOX contains 3960mg of a combination of these five amino acids (most likely in weights close to the ones described above).

A 2010 study found that mice who were given an SAA formulation (containing roughly the same weights mentioned above) had significantly reduced tissue damage during exercise (swimming) resulting in increased stamina. Furthermore, the same study noted that SAA supplementation was able to effectively recover blood testosterone levels in the exercising mice. Judging by these results, SAA seems like the new miracle ingredient for workout supplements.

However, it is important to keep in mind this study was done on mice. Currently there are no published scientific studies regarding the effects of SAA supplementation in humans, let alone exercising humans.


While the rodent studies regarding SAA supplementation have shown promising results, there are no human studies upon which to draw conclusions. Since BLOX contains just SAAs, at the same weight as competing products which contain other ingredients (such as BCAAs or caffeine), it seems expensive. At a price of $1/serving, BLOX costs as much as competing products that offer the same weight of SAA as well as additional ingredients. On that basis, we cannot reccomend BLOX to even the “see for yourself” consumers.


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  1. Shin, Sunhee, et al. “Silk amino acids improve physical stamina and male reproductive function of mice.” Biological and Pharmaceutical Bulletin 33.2 (2010): 273-278.
  2. Shin, S. H., et al. “Stamina-enhancing effects of silk amino acid preparations in mice.” Laboratory Animal Research 25 (2009).

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