Good Health Magnesium Sustained Release is made in a slow release marine magnesium to help you through the day. It is a unique product, specifically designed to slowly release magnesium in your body over 8 hours, allowing your body to properly absorb and utilize magnesium as it needs it, without any negative digestive effects. Magnesium Sustained Release is a high strength magnesium formula that is made from Aquamin Mg. Aquamin Mg is marine sourced magnesium, derived from seawater and so it naturally contains many other trace minerals too. This natural marine form makes it easily utilised in the body. Key Features: High strength 500mg marine magnesium Slow release - over 8 hours for sensitive systems Naturally derived from seawater 1-a-day formula Key Benefits Releases slowly over 8 hours for continuous benefits Supports absorption & activity No diarrhoea side effects as magnesium slowly pass through GI tract. Ideal for sensitive systems