The concentration is the same for all three — PN 20 mg/ml; what differs is the intended area. HP VITARAN 2×1 ml — face, neck and décolleté: biorevitalisation and biorestructuring. HP VITARAN i 2×1 ml — the periorbital area: thin and dehydrated skin, dark circles, fine expression lines. HP VITARAN S 2×1 ml and 1×1 ml — scars, post-acne, stretch marks and fibrotic areas. A 33G × 4 mm needle is included.