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Beta Carotene, which your body converts to active Vitamin A, but which is derived from vegetable and fruit sources, does not carry the toxicity risk of Vitamin A which comes from fish liver sources. You can take higher amounts of Beta Carotene in supplemental form, 10 to 15 mg or 15,000 iu to 25,000 iu per day, without risk.
Symptoms of deficiency: acne, dry dull hair, dry skin, fatigue, poor growth, insomnia, thickened scaly skin on the palms and soles of the feet, frequent infections, night blindness, weight loss, dry eyes (progressing to ulceration of the cornea if untreated) and dry mouth.