Homogeneous, anhydrous formulations consist of: (A) glycerophospholipids of formula (I); (B) a polar or lipophilic substance having an affinity to glycerophospholipids; and optionally (C) an anhydrous di- or polyfunctional formulation adjuvant with at least 2 OH groups; and the molar ratios of (A):(B) and (A):(C) are 1:0.001-2 and 1:0.001-1 respectively. R1 = -CO-R; R2 = H or -CO-R; R = mono- or polyunsaturated 6-24C fatty acid residue; X = H; -CH2-CH2-NH3<+>; -CH2-CH2-N(CH3)3<+>; -CH2-CH(NH3<+>)-COO<->, -CH2-CH(OH)-CH2-OH or a group of formula (a):
