Caution should be used when giving multi-vitamin supplements because Beardies are very susceptible to vitamin A toxicity. Signs of Vitamin A overdose are: swelling of the throat, bloating of the body, and lethargy. I give my Beardies a small dose of multi-vitamins once a week. This is enough to ensure that they are getting all the vitamins they need, but not enough to cause problems. Watch out for multi-vitamin supplements that are very high in Vitamin A. The proper ratio of vitamin A to vitamin D to vitamin E should be 100:10:1. One popular "reptile vitamin" has an A to D ratio of over 600:1 instead of 100:10! So be careful when picking out your Beardie's vitamins.