Abstract
Summary
Carotene solubilized in water by the use of Tween 40 will support growth in vit. A-deficient rats when as little as 1.6 γ is injected intramuscularly daily. For maximum growth, approximately 4 to 6 times as much carotene is required parenterally as orally. Aqueous carotene is also well utilized when given subcutaneously. Carotene dissolved in cottonseed oil and administered parenterally is essentially not utilizable.
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