Ingested retinoids are bad for your intestinal track, your bones (may block vitamin D in calcium use), and will harden ligaments & tendons over time... particularly in the feet. They will certainly increase the turnover of the cells in your skin and reduce skin oil, as well as associated side-effects (dry skin, flakes, easier to get sun burns). But you have to weigh the cost-benefit of taking them. If you choose to do so, monitor your feet and lower legs, in particular. If you notice issues, either reduce intake or stop taking them.
The Vitamin A gel caps can be taken up to about 10 or 15 a day at 180% RDA each, but you are more likely to experience issues that high. The latest data indicates it's probably best if you're a runner to only take one every other day, or not at all. This assumes you get enough Beta Carotene or Retinol in your diet all ready. There is as yet zero data that normal Retinol has the same long-lasting effects as synthetic retinoids, like Isotrentinonen.
Calcium, Magnesium, and Zinc are all important to health and making sure you get enough is helpfull. Indigenious water supplies versus other water sources show that native peoples don't have that problem.
I agree with the other poster to, at the very least, try being more gentle with your skin and get more quality sleep. If the later is difficult, see a sleep center. Try giving yourself 12hrs to sleep. Cool room. Dark. No noise or wear earplugs. Be regular about when you go down. And you'll eventually stabilize to a good sleep pattern and 9hrs or less without needing an alarm. Alarms are bad. Make sure they're set to go off AFTER the time you expect to be getting up on your own.
Edited by Reti, 15 March 2011 - 09:16 PM.