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Excellent 2017 review on the safety and efficacy of creatine supplements: https://www.researchgate.net/publication/317612254_International_Society_of_Sports_Nutrition_position_stand_Safety_and_efficacy_of_creatine_supplementation_in_exercise_sport_and_medicine
2014 study indicating creatine supplementation can lower high blood pressure: https://nutritionj.biomedcentral.com/articles/10.1186/1475-2891-13-115
2003 study on creatine supplementation in vegetarians: https://paulogentil.com/pdf/Effect%20of%20Creatine%20and%20Weight%20Training%20on%20Muscle%20Creatine%20and%20Performance%20in%20Vegetarians.pdf
2015 study showing higher rates of testicular cancer among men who took over-the-counter muscle-building supplements, including (but not limited to) creatine: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4385953/
Scholarly response to the testicular cancer study, pointing out the real culprit might be anabolic steroids: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4705873/
1993 Associate Press article about creatine use in the 1992 Olympics: https://apnews.com/article/ea59b25346d362d22d4beaf673af66fe
Mount Sinai Health System website offering advice on creatine supplementation to the general public: https://www.mountsinai.org/health-library/supplement/creatine