DS Laboratories Spectral F7 Advanced Booster Agent 60mlSpectral. F7 is a novel boosting agent that incorporates Astressin B, a powerful novel peptide. Our water based formula avoids leaving an oily or sticky residue and is formulated for both men and women. The key ingredients are encapsulated in our proprietary Advanced Nanosome Delivery System which offers higher penetration for maximum results. Our water based formula avoids leaving an oily or sticky residue and is formulated for both Men and Women.