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Description
Human equivalent ~5mg/kg/day using FDA allometric scaling

Amphetamines: tighter controls on the horizon
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The claim denies

Inadequate secretion of intrinsic factor, resulting from lesions that destroy the gastric mucosa (ingestion of corrosives, extensive neoplasia), and a number of conditions associated with a variable degree of gastric atrophy (such as multiple sclerosis, certain endocrine disorders, iron deficiency, and subtotal gastrectomy)
