Here are some other ways to help increase levels of glutathione, along with taking care to optimize vitamin D: limit alcohol consumption decrease exposure to POPs increase intake of other antioxidants to decrease overall oxidative stress increase intake of nutrients that promote glutathione production, such as NAC (N-acetylcysteine), 1000 mg/day, whey, or SAMe get enough magnesium and selenium in the diet, as both are necessary for glutathione production foods such as almonds, cruciferous vegetables, and even alcohol-free beer have been shown to raise glutathione levels, as has exercise and meditation
The human major histocompatibility complex and endocrine disease
PMID 7596706
Better sleep then enhances memory, focus, and mental energy
And if you're struggling with persistent headaches, too much vitamin B12 from injections might be a contributing factor
Specific roles of phosphatidylglycerols in hosts and microbes