Hypervitaminosis A

Vitamin A is a micronutrient important for vision, cell growth, reproduction and immunity. Both deficiency and excess consuming of vitamin A cause severe health consequences. Although discovered as the first lipophilic vitamin already more than a century ago and the definition of precise biological roles of vitamin A in the setting of health and disease, there are still many unresolved issues related to that vitamin. Prototypically, the liver that plays a key role in the storage, metabolism and homeostasis of vitamin A critically responds to the vitamin A status...

BACKGROUND: In Tanzania, some districts have single vitamin A (VA) interventions and others have multiple interventions. There is limited information on total liver VA reserves (TLRs) among preschool children (PSC) in Tanzania. OBJECTIVES: We assessed total body VA stores (TBSs) and TLRs among PSC living in 2 districts with low and high exposures to VA interventions using 13 C-retinol isotope dilution. METHODS: A cross-sectional, health facility-based study was conducted in 2 districts with access to VA supplementation only (low exposure to VA interventions) or multiple interventions (high exposure to VA interventions) to determine TLRs in 120 PSC aged 36-59 months...

UNLABELLED: Despite the rare occurrence of vitamin D toxicity in infants, increased use of vitamin D formulations as well as incorrect supplement concentration by manufacturing pharmaceutical companies, has contributed to an increased incidence of vitamin D toxicity. Over-the-counter vitamin D preparation constitutes variable concentrations that can render life-threatening consequences in children. CASE PRESENTATION: Here, we present a case of a 2.5-month-old infant presenting with failure to thrive...

Carotenoids are determinants of reproductive fitness and egg quality. Here we studied the accumulation of astaxanthin (AX), canthaxanthin (CA) zeaxanthin (ZX), lutein (LU), retinol (RX) and dehydroretinol (DR) during vitellogenesis comparing previtellogenic and vitellogenic pikeperch ( Sander lucioperca ) eggs (n = 5 each), as well as selected tissues (liver, fat and muscles) in first süawning females (1176-1450 g). Futhermore, we compared egg batches with high (88-99% hatching rate, n = 5) or low (40-67% hatching rate, n= 5) egg quality...

BACKGROUND: Globally, urolithiasis is becoming more and more common among children. We aimed to determine the etiology, and the diagnostic and therapeutic approaches in patients with urolithiasis. METHODS: This was a retrospective study which included all patients (aged 1 month-18 years) admitted to the pediatric nephrology clinic in Elazığ Fethi Sekin City Hospital with urolithiasis between November 2019 and 2021. Only patients whose diagnosis of urolithiasis was confirmed by urinary ultrasonography were included in the study, while patients with chronic diseases (neurological diseases such as epilepsy, cerebral palsy, chronic bowel diseases, etc...

Vitamin and mineral supplements are commonly used in diets for zoologic and companion animals. Because specific nutrient requirements are often unknown, informed decisions are based on literature for related species. Over 18 mon beginning in November 2017, an entire population of spot-tailed earless lizards ( Holbrookia lacerata and Holbrookia subcaudalis ) died (N = 33). All but two lizards were submitted for histopathology (94%). All examined cases had mineralization in at least one tissue; 71% (22 of 31) had multisystemic mineral deposits consistent with metastatic mineralization...

OBJECTIVE: To evaluate children with suspected or definite hypervitaminosis D with respect to prevalence, clinical manifestations and pharmacological aspects. METHODS: The retrospective cross-sectional study was conducted at the Aga Khan University Hospital, Karachi, and comprised medical records from January 1 to December 31, 2018, of children aged <18 years with 25-hydroxyvitamin D levels >50ng/ml. Clinical and pharmacological data was retrieved. Data was analysed using SPSS 23...

BACKGROUND: We aimed to evaluate the risk of hypercalcemia in the elderly population with hypervitaminosis D and vitamin D intoxication. METHODS: A total of 121 patients with a 25(OH) vitamin D level > 100 ng/mL from patients aged ≥ 65 years who applied to our hospital between 2014 and 2020 were included in this study. Sixty-nine patients with 25(OH) vitamin D levels of 100 - 150 ng/mL were determined as D hypervitaminosis; 52 patients with 25(OH) vitamin D levels > 150 ng/mL were determined as vitamin D intoxication...

BACKGROUND: Changes to the iPLEDGE platform on December 13, 2021 made isotretinoin virtually inaccessible for many patients. Prior to the FDA approval of isotretinoin, a derivative of vitamin A, in 1982, vitamin A was used for severe acne. OBJECTIVE: To review the efficacy, safety, affordability, and practicality of vitamin A as a substitute for isotretinoin when the latter is inaccessible. METHODS: A literature review of PubMed was conducted using the key words: oral vitamin A, retinol, isotretinoin, Accutane, acne, iPLEDGE, hypervitaminosis A, and side effects...

BACKGROUND: Since the previous Cochrane Review on this topic in 2016, debate has continued surrounding a potential role for vitamin D in reducing risk of asthma exacerbation and improving asthma control. We therefore conducted an updated meta-analysis to include data from new trials completed since this date. OBJECTIVES: To evaluate the effectiveness and safety of administration of vitamin D or its hydroxylated metabolites in reducing the risk of severe asthma exacerbations (defined as those requiring treatment with systemic corticosteroids) and improving asthma symptom control...

Vitamin B12, or cobalamin, belongs to the group of water-soluble vitamins and is ingested through food of animal origin such as eggs, milk, red meat and poultry, fish, and shellfish. Its clinical indication is the treatment of hypovitaminosis B12 administered orally or intramuscularly in the form of hydroxocobalamin. Hypovitaminosis B12 is mainly caused by deficient dietary intake (individuals with malnutrition, vegetarians or vegans, older adults, pregnant people, individuals with alcohol use disorder); when intestinal absorption is reduced (atrophic gastritis, malabsorption syndrome, gastrointestinal surgery); and for causes associated with the intake of drugs (antacids, metformin)...

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Vitamin D is a cyclopentane polyhydrophenanthrene compound involved mainly in bone health and calcium metabolism but also autophagy, modulation of the gut microbiota, cell proliferation, immune functions and intestinal barrier integrity. The sources of vitamin D include sunlight, diet and vitamin D supplements. Vitamin D3, the most effective vitamin D isoform is produced in the human epidermis as a result of sunlight exposure. Vitamin D undergoes two hydroxylation reactions in the liver and kidney to reach its active form, 1,25-dihydroxyvitamin D...

The use of over-the-Counter (OTC) pharmaceuticals is a common phenomenon in today's society. We present a case of liver injury associated with long-term OTC use of vitamin A. The young patient took daily up to 15 capsules of a combined preparation for 2 years containing retinol palmitate 55 mg (100,000 IU) + Alpha-Tocopherol acetate 100 mg, the content of vitamin A in which significantly exceeded the recommended daily dose. Gradually, the patient noted the appearance of arthralgia, skin itching, hyperemia of the palms and feet, exfoliation of the skin on the soles, profuse hair loss, cracks in the corners of the mouth and in the area of the earlobes...

Douglas Mawson is a national hero of Australia, having led the Australasian Antarctic expedition of 1911, and survived. His three-man sledging team was beset by a series of catastrophes. First, expert skier Belgrave Ninnis died after he fell into a deep crevasse taking with him half the dogs and a sledge of essential food and supplies. The remaining two explorers immediately turned back to base which was 315 miles away. With their rations diminished they resorted to eating their remaining six dogs over 23 days...

The importance of B complex vitamins starts early in the human life cycle and continues across its different stages. At the same time, numerous reports have emphasized the critical role of adequate B complex intake. Most studies examined such issues concerning a specific vitamin B or life stage, with the majority reporting the effect of either excess or deficiency. Deep insight into the orchestration of the eight different B vitamins requirements is reviewed across the human life cycle, beginning from fertility and pregnancy and reaching adulthood and senility, emphasizing interactions among them and underlying action mechanisms...

BACKGROUND: In Tanzania, some districts have single and others have multiple vitamin A (VA) interventions. There is limited information on total liver VA reserves (TLRs) among preschool children (PSC) in Tanzania. OBJECTIVES: We assessed total body VA stores (TBSs) and TLRs among PSC living in two districts with Low- and High-exposure to VA interventions using 13C-retinol isotope dilution. METHODS: A cross-sectional health facility-based study was conducted in two districts with access to VA supplementation only (Low-exposure) or multiple interventions (High-exposure) to determine TLRs in 120 PSC aged 36-59 mo...

Acute promyelocytic leukemia (APL) is a subtype of acute myeloid leukemia with distinctive morphological, clinical, and genetic features. Pseudotumor cerebri, also known as idiopathic intracranial hypertension, describes a neurologic syndrome characterized by headache, visual changes, papilledema without cerebral mass lesion, venous sinus thromboses, or obstructive hydrocephalus. Risk factors for the development of pseudotumor cerebri are obesity, women in the childbearing years, and hypervitaminosis A. The modified Dandy criteria are used for pseudotumor cerebri syndrome (PTCS) diagnosis...

Vitamin D, a secosteroid hormone, appears to have significant beneficial effects on various physiological systems, including the musculoskeletal system. Vitamin D assists in the regulation of numerous critical biological functions and physiological processes in humans, including inflammation, oxidative stress, and mitochondrial respiration, and is also linked to cardiac diseases. It is also reported that vitamin D plays a central role in molecular and cellular mechanisms, which reduce oxidative stress, and tissue damage and regulate cellular health...

BACKGROUND: Young children exposed to high-dose vitamin A supplements (VAS) and vitamin A (VA)-fortified foods may be at risk of high VA intake and high VA total body stores (TBS). OBJECTIVES: TBS and estimated liver VA concentration were compared among children with adequate or high VA intake and different timing of exposure to VAS, and associations between estimated liver VA concentrations and biomarkers of VA toxicity were examined. METHODS: Children 12-18 mo of age ( n  = 123) were selected for 3 groups: 1 ) retinol intake >600 µg/d and VAS within the past mo, 2 ) retinol intake >600 µg/d and VAS in the past 3-6 mo, and 3 ) VA intake 200-500 µg retinol activity equivalents (RAE)/d and VAS in the past 3-6 mo...