618 citations
,
January 2018 in “Cochrane Database of Systematic Reviews” Selenium supplements do not prevent cancer and may increase certain health risks.
93 citations
,
March 2014 in “Cochrane Database of Systematic Reviews” Selenium supplements do not prevent cancer and may have harmful effects.
92 citations
,
November 2003 in “The Journals of Gerontology” Testosterone supplements can increase muscle mass and strength in older men with low levels, but long-term effects and risks need more research.
78 citations
,
January 2017 in “Skin appendage disorders” Biotin supplements may improve hair and nail growth in people with certain deficiencies or conditions, but there's not enough evidence to recommend it for healthy individuals.
57 citations
,
February 2018 in “Journal of the American Academy of Dermatology” Biotin supplements are not proven to improve hair or nails and may interfere with medical tests.
55 citations
,
July 1983 in “Journal of the American Academy of Dermatology” Biotin supplements can effectively treat hair loss and skin issues in certain enzyme deficiencies.
47 citations
,
November 2010 in “Vox Sanguinis” Iron supplements helped female blood donors with low iron avoid anaemia and return to donate again.
45 citations
,
June 1984 in “Journal of the American Veterinary Medical Association” Zinc supplements quickly improved health issues in sheep and goats.
24 citations
,
May 2017 in “PubMed” Biotin supplements for hair improvement are popular without scientific proof of effectiveness.
23 citations
,
August 1975 in “Experimental Biology and Medicine” Copper supplements during pregnancy improve survival and development in mutant mice.
21 citations
,
September 2017 in “Journal of Obstetrics and Gynaecology Research” Chromium supplements don't improve insulin, hormone levels, or cholesterol in women with PCOS but raise testosterone levels.
20 citations
,
June 2010 in “Dermatology Online Journal” Zinc supplements and weaning cured a breast-fed baby's zinc deficiency caused by a gene mutation.
12 citations
,
September 1981 in “Acta Dermato Venereologica” Zinc supplements improved the girl's hair growth and thickness.
11 citations
,
April 2018 in “Nutrition Research” Chromium supplements don't help with weight loss or improve hormone and metabolism issues in people with polycystic ovary syndrome.
7 citations
,
January 2022 in “Evidence-based complementary and alternative medicine” Ginger supplements helped reduce symptoms and improve metabolic health in hypothyroid patients.
6 citations
,
January 2000 in “The Journal of Trace Elements in Experimental Medicine” Zinc supplements effectively treat acrodermatitis enteropathica.
6 citations
,
September 1996 in “Journal of the European Academy of Dermatology and Venereology” Biotin supplements may help hair regrowth in alopecia areata patients with low biotinidase activity.
5 citations
,
October 2019 in “Giornale italiano di dermatologia e venereologia” Biotin supplements can improve certain skin disorders and hair loss when a deficiency is present.
4 citations
,
January 2011 in “Dermatologic Therapy” Zinc supplements improved hair loss in patients with zinc deficiency.
3 citations
,
March 2022 in “International Journal of Trichology” Special supplements with collagen, vitamins, and minerals can help treat hair loss.
3 citations
,
June 2012 in “Korean Journal of Human Ecology” The supplement reduced hair loss and increased hair thickness safely.
3 citations
,
January 2007 in “Korean Journal of Pediatrics” Zinc supplements can help skin issues even if blood zinc levels are normal.
2 citations
,
November 2025 in “Nutrition Journal” Probiotic supplements may help reduce inflammation and oxidative stress in women with PCOS.
2 citations
,
August 2022 in “Reproductive Biology and Endocrinology” Magnesium supplements improved quality of life for women with polycystic ovary syndrome, but didn't help with acne, hair loss, or abnormal bleeding.
Vitamin supplements may not improve hair thickness or density in patients with non-scarring hair loss.
2 citations
,
January 2016 in “DOAJ (DOAJ: Directory of Open Access Journals)” Zinc supplements may help reduce hair loss caused by levetiracetam without affecting seizure control.
1 citations
,
March 2020 in “̒Ulūm-i dārūyī” Selenium supplements improved liver and kidney function and reduced hair loss in beta-thalassemia major patients.
1 citations
,
November 2017 in “International journal of clinical endocrinology and metabolism” The supplement with Myo-inositol and D-chiro-inositol improves metabolic symptoms in PCOS, especially when combined with metformin.
1 citations
,
January 2015 in “Hair therapy & transplantation” Some supplements and hormones can increase hair loss by raising DHT levels.
1 citations
,
September 1996 in “Journal of the European Academy of Dermatology and Venereology” Biotin supplements may help hair regrowth in some alopecia areata patients.