There are many different types of glutathione supplements. There are pills, sprays, suppositories, and injections. The oral supplements are composed mainly of glutathione precursors, as the glutathione molecule is too large to be absorbed by the stomach or intestines. The most popular oral precursors are NAC and whey protein. These have both been proven to be effective ways to increase your glutathione levels.
NAC is probably the most recommended and easiest ways to increase your levels orally. NAC is a form of cystine and is a precursor of glutathione. Most doctors recommend around 250mg of NAC daily. Another oral supplement that work is whey protein. Whey protein is high in cystine, which is then converted into glutathione in the body.
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Glutathione I.V. pushes are probably the most direct way to increase your levels. These are very effective, but can expensive and it may be hard to find a local doctor that will administer them to you. These are administered in a doctors office and can take about 15 minutes.
Two newer ways that people are using to bring up depleted glutathione levels are suppositories and sprays. Suppositories can be an effective way to administer glutathione and are a more direct route as opposed to taking pills orally. Much is absorbed through his method and it can be a cheaper way to administer. these aren't available on the market as of yet so you may have to have these compounded in a pharmacy. There are glutathione sprays available for purchase, but i believe that this method of administration in not as effective as the suppository form.
If i had to choose one method that was the most effective by way of price and absorption, I would choose nac pills. These glutathione supplements are available at most health food stores and are reasonably priced. If you are looking for the easiest solution, then i believe that NAC is the best choice.