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vitamins
Vitamin A (Retinol) Function and Deficiency
Mechanism
Retinol
Constituent of Visual Pigments
Differentiation of Epithelial Cells into Specialized Tissue
Signs and Symptoms
Night Blindness
Dry Skin
Considerations
Used to Treat Measles
Antioxidant
2 mins
Vitamin A (Retinol) Toxicity
Signs and Symptoms
Alopecia
Vision Changes
Headache
Skin Changes
Hyperlipidemia
Hepatotoxicity
Arthralgias
Teratogen
Cleft palate
Cardiac Abnormalities
3 mins
Vitamin B1 (Thiamine)
Mechanism
Branched-chain Ketoacid Dehydrogenase
Pyruvate Dehydrogenase
Alpha-ketoglutarate Dehydrogenase
Transketolase
DEFICIENCY EFFECTS
Wernicke-Korsakoff Syndrome
Beriberi
ATP Depletion
Aerobic Tissues Like Brain and Heart Affected First
Considerations
Deficiency Can Worsen with Glucose Infusion
2 mins
Riboflavin (Vitamin B2)
Classification
Vitamin B2
Biochemistry
FAD
FAD Makes 1.5 ATP
Succinate to Fumarate
DEFICIENCY
Glossitis
Cheilosis
Corneal Vascularization
2 mins
Vitamin B3 (Niacin)
Derived from Tryptophan
Synthesis Requires Vitamin B6
Constituent of NAD+
Deficiency Causes
Hartnup Disease
Carcinoid Syndrome
Deficiency Symptoms
Pellagra
Diarrhea
Dermatitis
Dementia
Glossitis
Excess Symptoms
Flushing
2 mins
Vitamin B5 (Pantothenate)
Mechanism
Pantothenate
Pyruvate Dehydrogenase
Coenzyme A
Fatty Acid Synthase
Deficiency Signs and Symptoms
Enteritis
Dermatitis
Alopecia
Adrenal Insufficiency
2 mins
Vitamin B6 (Pyridoxine)
Pyridoxal Phosphate
Mechanism
Transamination
Decarboxylation
Glycogen Phosphorylase
Cystathionine Synthase
Functions
Heme Synthesis
Niacin Synthesis
Neurotransmitter Synthesis
2 mins
Vitamin B6 (Pyridoxine) Deficiency
Deficiency From Isoniazid
Deficiency From Oral Contraceptives
Seizures
Hyperirritability
Peripheral Neuropathy
Sideroblastic Anemia
3 mins
Biotin (Vitamin B7)
Mechanism
Carboxylation Reaction
Pyruvate Carboxylation to Oxaloacetate
Propionyl-CoA Carboxylation to Methylmalonyl-CoA
Acetyl-CoA Carboxylation to Malonyl CoA
Deficiency Causes
Antibiotic Use
Ingestion of Raw Eggs
Signs & Symptoms
Alopecia
Dermatitis
Enteritis
2 mins
Folate Deficiency
Clinical Features
Macrocytic Anemia
Megaloblastic Anemia
Etiologies
Malabsorption
Dietary
Tea and Toast
Alcoholics
Medication-induced
Methotrexate
Trimethoprim
Increased Requirement
Hemolytic Anemia
Pregnancy
2 mins
Vitamin B12 (Cobalamin) Deficiency Causes
Causes
Vegans
Pernicious Anemia
Gastric Bypass Surgery
Malabsorption
Sprue
Enteritis
Crohn's Disease
Diphyllobothrium latum
4 mins
Vitamin E Deficiency
Mechanism
Antioxidant
Protects Erythrocytes
Protects from Free Radical Damage
Deficiency Signs and Symptoms
Hemolytic Anemia
Posterior Column
Spinocerebellar Tract
2 mins
Vitamin E (Alpha-tocopherol)
Mechanism
Antioxidant
Indications
Fat Malabsorption Syndrome
Alpha-TTP Deficiency
Side Effects
Bleeding
Considerations
Increased Risk Hemorrhagic Stroke
Limit Doses < 200 IU per Day
Nuts and Whole Grains
Vegetable Oils
2 mins
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