The foods highest in vitamin B12 are: Organ meats, such as beef and chicken liver Wild-caught fish, including salmon, herring, mackerel, tuna, trout and sardines (also great sources of other vital nutrients, like omega-3 fatty acids) Organic dairy products, including probiotic-rich yogurt or raw milk Pasture-raised poultry, including turkey or chicken Grass-fed beef and lamb When its not possible to get enough vitamin B12 from your diet, perhaps due to genetic conditions or taking necessary medications, someone might choose to boost intake of vitamin B12 in several ways other than receiving injections
Further analyses revealed that changes in blood GSH were highly correlated with those in erythrocytes, and changes in lymphocyte GSH were significantly correlated with those in both blood and erythrocytes
Liu JS, Peng SJ, Li GF, Zhao YX, Meng XY, Yu XR, Li ZH, Chen JM
Even if GHK-Cu itself causes no reaction, you might have sensitivities or allergies to other ingredients in the formulation