DS Laboratories Spectral F7 Efficacy Booster Hair Stimulation With Avec Astressin-B Complex is a novel boosting agent that incorporates Astressin-B, a powerful novel peptide. This water-based formula avoids leaving an oily or sticky residue and is formulated for both men and women. The key ingredients are encapsulated in this proprietary Advanced Nanosome Delivery System which offers higher penetration for maximum results. This water-based formula avoids leaving an oily or sticky residue and is formulated for both Men and Women.