I found this: however you can always email D&H they should tell you what it contains.
D & H Build and Glow Contains a blend of fats from palm oil, full fat soya & full fat linseed to provide a highly digestible, palatable supplement for weight gain & overall condition. Free from prohibited substances, including gamma oryzanzol, & complies with the new BETA NOPS code. Added lecithin helps improve fat utilisation & supports a calm, even temperament, Provides controlled, slow releasing energy to help minimise excitability, Contains essential fatty acids for skin & coat condition and is enhanced with vitamin E & QLC antioxidants to support the immune system.
Maybe try and get a sample, my pony won't eat it, he ends up picking around it and leaving it all at the bottom of his bucket and he normally eats anything!!