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Injectable forms carry more risk, including kidney, liver, and thyroid concerns
When vitamin A deserves review Very restrictive or very low-fat diets Fat malabsorption or chronic diarrhea Pancreatic, biliary or inflammatory gastrointestinal disease Significant liver disease or impaired nutrient storage Poor night vision or other signs suggesting vitamin A deficiency Persistent low ceruloplasmin after protein and mineral factors are corrected Why high-dose vitamin A is not automatic Preformed vitamin A is stored in the liver
Gastroenterology 137:856864
"Leave-on products like serums, foams, or scalp treatments are more effective than shampoos for hair growth because they stay on the scalp long enough for peptides to penetrate and signal the follicle," Queller says
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