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This case report highlights an atypical presentation of vitamin B12 deficiency in a 28-year-old man with reversible symptoms including localized hand hyperpigmentation and megaloblastic anemia, resolved after B12 supplementation.

This case report observed that a selenium-deficient diet in a child with propionic acidaemia led to macrocytosis and hair abnormalities, which improved with selenium supplementation.

This review examines the main absorption sites and influencing factors for orally administered drugs, highlighting variables such as solubility and gastrointestinal conditions that affect drug absorption in the small intestine and the development of effective drug delivery systems.

This clinical case highlights the importance of early diagnosis of celiac disease, illustrating how recognition of symptoms and risk factors can prevent delayed treatment.

This study found that while micronutrient abnormalities are common among patients receiving home parenteral nutrition, serious consequences from these abnormalities are rare.

In this study, a syndrome of zinc deficiency was observed in adults receiving intravenous feeding, with zinc supplementation improving symptoms except for delayed hair regrowth.

This study reported a case where a 46-year-old woman developed alopecia without itching or pain on her scalp due to a cutaneous infection from *Mycobacterium abscessus*, which was resolved after three months of antibacterial treatment, resulting in new hair growth.

This study highlights two newly discovered metabolic disorders of biotin, showing distinct skin and hair symptoms and severe complications like acidosis and ketosis.

This case report describes a 4-month-old child with symptoms suggesting multiple carboxylase deficiency, which responded well to biotin therapy, highlighting the importance of early diagnosis and treatment to prevent serious health issues in infants with similar unexplained metabolic acidosis and symptoms.

This study found that early diagnosis using gas chromatography/mass spectrometry and appropriate long-term treatment are crucial for improving outcomes in patients with methylmalonic acidemia.

This study reports zinc and biotin deficiencies leading to hair loss and skin issues in a teenager after pancreaticoduodenectomy, highlighting the need for supplementation to prevent long-term damage.

This case report describes chronic iron deficiency anemia in a patient with Cronkhite-Canada syndrome, highlighting the need for more data to guide treatment and cancer surveillance due to its rarity and mortality risk.

This case report identifies necrolytic migratory erythema associated with a glucagonoma in a 40-year-old man, presenting with distinct skin lesions, weight loss, and diarrhea.

This case report highlights a female patient with familial partial lipodystrophy who showed significant improvement in liver stiffness after starting leptin replacement therapy.

This case study highlights that vitamin B12 deficiency can cause reversible hyperpigmentation, illustrated by a vegetarian female patient whose skin lesions improved after treatment.

In this study, two patients with long-term total parenteral nutrition and no biotin intake experienced hair regrowth after biotin supplementation, suggesting biotin deficiency can lead to alopecia.

This study reported that severe hair disturbances in infants and young children are associated with acute vitamin deficiencies in tropical America, unlike the milder cases observed in the United States.

This case report of a 16-month-old girl with acrodermatitis enteropathica, who showed atypical symptoms and normal zinc serum levels, highlights how genetic testing and zinc supplementation led to marked improvement in her condition, underscoring the importance of accurate diagnosis in metabolic disorders.

This case report describes a 37-year-old Filipino man with Cronkhite-Canada syndrome who improved after receiving nutritional support and medical treatment, despite the typically poor prognosis of the condition.

This review discusses the clinical manifestations of malnutrition in children, particularly highlighting the overlapping skin changes from various nutrient deficiencies, and reports no new clinical results.

This case report describes a 47-year-old male with rare total melanonychia linked to vitamin B12 deficiency, whose nail discoloration and constitutional symptoms improved following vitamin B12 supplementation.

This case report presents a patient with necrobiosis lipoidica exhibiting transepithelial elimination of cholesterol crystals through hair follicles, a finding previously associated with necrobiotic xanthogranuloma.

This case report describes a rare instance of reversible melasma-like hyperpigmentation linked to vitamin B12 deficiency due to pernicious anemia, and explores possible mechanisms for this association.

This case study of three siblings highlights the importance of recognizing dermatologic signs—alopecia and periorificial dermatitis—for early diagnosis and treatment of biotin-responsive multiple carboxylase deficiency.

This report presents two cases of Berardinelli–Seip syndrome, emphasizing the role of genetic analysis and comprehensive care in managing the variability and complications of this rare condition.

This case study describes a child with an unusual form of vitamin D-dependent rickets, characterized by alopecia and a deficient response to active vitamin D.

This case report describes a 7-month-old girl diagnosed with acrodermatitis enteropathica, linked to low zinc levels, whose skin lesions improved significantly after zinc supplementation.

This study reported successful treatment of biotin deficiency in three patients receiving total parenteral nutrition, suggesting current biotin supplementation recommendations may be inadequate to maintain normal biotin status.

This study observed that hair loss after bariatric surgery is the most common nutritional symptom linked to iron and protein deficiencies, while the causes of other symptoms remain unclear.