Vitamin A may take time. Has the number increased even if it's still in the low range? If it has, then you are going in the right direction. Talk to your PCP, he may have a better idea for Vit A supplements, or it may be just that you may need to double your dose for a while, or, if the number is rising even if it is still low, then just wait another couple of months.
Vitamin A is a fat soluble vitamin, so, you can ge an overdose, once you are out of the deficient range, so be sure to be monitored every 2-3 months if you double the dosage.
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