Mayo Clinic: "Is it Possible to Take Too Much Vitamin C?" National Institutes of Health Office of Dietary Supplements: "Zinc" MedlinePlus: "Drug-induced Diarrhea" National Eating Disorder Association: "Laxative Misuse" National Cancer Institute: "Water-soluble Vitamin" National Institutes of Health Office of Dietary Supplements: "Omega-3 Fatty Acids" New England Journal of Medicine: "Marine n-3 Fatty Acids and Prevention of Cardiovascular Disease and Cancer" Harvard Health Publishing: "Fish Oil: Friend or Foe?" National Institutes of Health Office of Dietary Supplements: "Magnesium" Sports Medicine: "Gastrointestinal Complaints During Exercise: Prevalence, Etiology, and Nutritional Recommendations" Academy of Nutrition and Dietetics: "Easy Ways to Boost Fiber in Your Daily Diet" Clinical Endocrinology: "Vitamin D toxicity resulting from overzealous correction of vitamin D deficiency" Mayo Clinic: "What is vitamin D toxicity

GHK-Cu and AHK-Cu are research compounds and are not intended for human consumption or cosmetic self-application
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However, three major reviews didnt show sufficient evidence to support this claim (14, 15, 16)
See B12 shot locations
B12 shots and sublingual B12 are superior to oral tablets for absorption, especially if you have GI issues