Product description spectral. f7 astressin b topical solution is technology that is years ahead of its time. DS Laboratories is the first biotechnology developer to synthesize and commercialize this cutting edge peptide in a cosmetic product. Spectral. f7 offers a completely new mechanism of action and is therefore an important new tool in a program to maintain healthy hair. This peptide has received extensive media coverage due to remarkable results observed in laboratory animals. Further testing by DS Laboratories on human volunteers revealed a surprisingly high level of efficacy. Because this result was obtained through a totally new modality, spectral. f7 was developed to be used as a booster in conjunction with existing treatments. For early stage thinning hair, it can be used as a single line therapy. It is very convenient to use, and the product leaves a pleasant texture, not greasy or sticky.