A composition comprising a mixture of phospholipid compounds of formula: wherein: - R 1 and R 2 are each independently selected from a fatty acid moiety of formula -COC n H m, a fatty acid moiety of formula -CH 2 C n H m, and -H, wherein n is an integer in the range of 4-24 and m=2(n-p)+1, where p is the number of double bonds in the fatty acid moiety; - Ri and R 2 include omega-3 fatty acid moieties, such that at least 30% by weight of the phospholipid compounds is composed of omega-3 fatty acid moieties; - at least 90% by weight of total omega-3 fatty acid moieties are at position R 2; - R 1 and R 2 are not both -H in a phospholipid compound, and R 1 or R 2 is -H in less than 3% by weight of the compounds of formula; - R 3 is selected from -H, a choline moiety, an ethanolamine moiety, a N-acetylethanolamine moiety, an inositol moiety, and a serine moiety; and - R 3 is a choline moiety in at least 85% by number of the compounds of formula. and wherein the composition also has one or more of the following properties: (a) at least 85% by weight of the composition consists of phospholipid compounds of formula, optionally wherein the composition is substantially free from acetone; (b) the weight ratio of C16:0 / C14:0 fatty acid moieties in the mixture is between 10:1 and 18:1 and/or the weight ratio of C18:4 n-3 / C18:3 n-3 fatty acid moieties is between 1:1 and 3:2; (c) the composition includes less than 300μg astaxanthins per gram of phospholipid; (d) the composition comprises less than 0.01% by weight trimethylamine N-oxide; (e) the composition comprises less than 0.01% by weight homarine; (f) the composition includes less than 5% by weight water; (g) the composition has less than about 0.03% by weight PUFA polymers (h) the mixture includes both phospholipids where R 1 is a fatty acid moiety of formula -COC n H m and phospholipids where R 1 is a fatty acid moiety of formula -CH 2 C n H m; (i) the mixture includes both phospholipids where R 1 is an omega-3 fatty acid moiety and phospholipids where R 2 is an omega-3 fatty acid moiety; (j) the composition includes less than 5% by weight sphingomyelin; (k) the composition is free from chloroform and hexane; and/or (l) less than 0.9% by weight of phospholipids in the composition is formed of compounds where R 1 or R 2 is-H, or more than 1.1% by weight of phospholipids in the composition is formed of compounds where R 1 or R 2 is -H. - R 1 and R 2 are each independently selected from a fatty acid moiety of formula -COC n H m, a fatty acid moiety of formula -CH 2 C n H m, and -H, wherein n is an integer in the range of 4-24 and m=2(n-p)+1, where p is the number of double bonds in the fatty acid moiety; - Ri and R 2 include omega-3 fatty acid moieties, such that at least 30% by weight of the phospholipid compounds is composed of omega-3 fatty acid moieties; - at least 90% by weight of total omega-3 fatty acid moieties are at position R 2; - R 1 and R 2 are not both -H in a phospholipid compound, and R 1 or R 2 is -H in less than 3% by weight of the compounds of formula; - R 3 is selected from -H, a choline moiety, an ethanolamine moiety, a N-acetylethanolamine moiety, an inositol moiety, and a serine moiety; and - R 3 is a choline moiety in at least 85% by number of the compounds of formula. (a) at least 85% by weight of the composition consists of phospholipid compounds of formula, optionally wherein the composition is substantially free from acetone; (b) the weight ratio of C16:0 / C14:0 fatty acid moieties in the mixture is between 10:1 and 18:1 and/or the weight ratio of C18:4 n-3 / C18:3 n-3 fatty acid moieties is between 1:1 and 3:2; (c) the composition includes less than 300μg astaxanthins per gram of phospholipid; (d) the composition comprises less than 0.01% by weight trimethylamine N-oxide; (e) the composition comprises less than 0.01% by weight homarine; (f) the composition includes less than 5% by weight water; (g) the composition has less than about 0.03% by weight PUFA polymers (h) the mixture includes both phospholipids where R 1 is a fatty acid moiety of formula -COC n H m and phospholipids where R 1 is a fatty acid moiety of formula -CH 2 C n H m; (i) the mixture includes both phospholipids where R 1 is an omega-3 fatty acid moiety and phospholipids where R 2 is an omega-3 fatty acid moiety; (j) the composition includes less than 5% by weight sphingomyelin; (k) the composition is free from chloroform and hexane; and/or (l) less than 0.9% by weight of phospholipids in the composition is formed of compounds where R 1 or R 2 is-H, or more than 1.1% by weight of phospholipids in the composition is formed of compounds where R 1 or R 2 is -H.