RT Journal Article SR Electronic T1 A–Z of nutritional supplements: dietary supplements, sports nutrition foods and ergogenic aids for health and performance—Part 22 JF British Journal of Sports Medicine JO Br J Sports Med FD BMJ Publishing Group Ltd and British Association of Sport and Exercise Medicine SP 752 OP 754 DO 10.1136/bjsports-2011-090180 VO 45 IS 9 A1 H Geyer A1 H Braun A1 L M Burke A1 S J Stear A1 L M Castell YR 2011 UL http://bjsm.bmj.com/content/45/9/752.abstract AB