Also known as sustained-release or extended-release, time-release products use a mechanism to dissolve the ingredients over time in order to be released slower and steadier into the bloodstream while having the advantage of being taken at less frequent intervals than immediate-release formulations.
Time-release pills are available in tablets or capsules and are designed to release a steady stream of the substance into your system over a certain period of time, generally six to eight hours. The majority of time-release products are formulated so that the active ingredient is embedded in a matrix of insoluble substance such as acrylics or even chitin. This dissolving substance has to find its way through the gaps in the matrix. Alternatively, the ingredients may be combined with other substances that, once ingested, swell up to form a gel with a near impenetrable outer coating, therefore releasing the active ingredient slowly.
You can find a variety of time-release products including multivitamins, vitamins B and C, niacin, melatonin, alpha lipoic acid, and many other supplements.