Swanson Multi-Mineral Citrate Complex 60 Capsules Highly absorbable multi-mineral complex 4 essential minerals Effective citrate forms of mineral Per GMP guidelines set forth by the FDA, most products are formulated for 24 months from the date of manufacture. Liquids and probiotics are formulated for 12 months. Minerals come in many forms, some more bioavailable than others. Nutritionists generally recognize the citrate forms as being one of the most effective for dietary supplements.