Pharmics - Ferretts IPS Liquid Iron Supplement (8 fl oz) Iron Protein Succinylate Iron Supplement 40mg / 15ml Iron Supplement Iron Protein Succinylate is a proprietary stabilized iron compound. The iron is wrapped in a casein protective layer, which allows the iron to pass through the stomach to the intestinal tract for immediate safe and efficacious absorption. FERRETTS IPS Liquid is for use as a supplement.