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"The discovery of vitamin K, its biological functions and therapeutical application" (PDF)

This is why glutathione is a staple for multi-day stage racers like cyclists, runners recovering from oxidative stress

Despite their many serious side effects, including constipation, nausea, vomiting, respiratory depression, sedation, dysphoria, addiction, and tolerance [14,42,43], opioids have long been the most widely used analgesics and are considered the standard of care for the treatment of various pain states due to their high efficacy and availability [43,44]

That means COA-verified vendors with recent third-party HPLC testing

If you are comparing suitability, progression, or the best place to start, ask before you buy so the training you choose actually fits the stage you are at.