I have been taking Vitamin D3 for over a year, and it has improved my skin.

I didn't have bad acne before, and I was able to keep it under control by following the acne regimen recommended here. Then I found out I was completely deficient in Vitamin D. By that, I mean, I had NONE! After reading up on this topic, I learned this is a common problem with most people in North America, or in northern climates, where the sun isn't strong enough most of the year for people to get enough Vitamin D from daily exposure. With worries about skin cancer, and using lots of sun screen, people also don't get enough exposure. (And no, tanning salons don't provide the right type of rays, so they're useless for trying to increase your Vitamin D.) Vitamin D deficiency is nearly endemic in North America, and I don't understand why the medical community doesn't check for it regularly. It is an easy test. You can even order a test via mail order: Vitamin D Council Test Kit

Vitamin D is actually a hormone. Once I got my Vitamin D levels up, my skin improved. I still use my skin care regimen, but before increasing my Vitamin D, I used to get occasional episodes of breakouts. They were maddening, since I am pretty religious about following the regimen, so I couldn't figure out why I would still get random episodes of skin breakouts. Now those breakout episodes are far less frequent, and I can generally correlate them to lack of sleep. (After a week of not enough sleep, my skin will break out.) I take Vitamin D3, and Magnesium. Plus I try and get K2 through eating grass fed dairy. You need Magnesium and K2 for your system to help absorb Vitamin D. You can get K from eating things like kale and spinach, but it's K2 that you need for good Vitamin D absorption. Gouda cheese is another good source of K2, and it doesn't have to be grass fed, organic Gouda. (It has something to do with the enzymes and bacteria that produce Gouda,) I haven't tried adding K2 supplements to my other ones, because the cheese seems to work for me.

Here are what I take:

• Natural Factors Vitamin D3, 50,000 IU, softgels, about once a week, or once every 2 weeks. (That's a LOT, and I think I could take probably reduce this to around 2000 IU daily. I simply haven't gotten around to changing my routine yet.) It took about 4 months for me to go from less than 12 mg/ml to around 40 mg/ml, which is the minimum recommended level for good health. Now I'm around 50 mg/ml, but I'd like to get to around 70, which is the upper limit.
• Magnesium Citrate, 250 mg, softgels, twice a day for a total of 500 mg daily. Magnesium can give you the runs, but the soft gels works well for me. You can also take baths with Epsom Salts, which has Magnesium in it. Your skin can absorb Magnesium pretty well this way, and then you don't need to take the supplements.

I periodically get my Vitamin D levels checked to see where they're at. I think this is prudent. Most people simply take Vitamin D without knowing if what they're taking is enough, or if it is producing any useful results. When I talk to people about this, they usually say something like "Oh, I take some Vitamin D every day." Well, if you're really deficient, (and chances are that you are), just taking a little bit every day isn't going to get your system enough Vitamin D to matter. I had to take 50,000 IU PER WEEK, for four months, to get up to the bare minimum recommended level. Plus I needed the Magnesium and K2 to be able to absorb it!

Some people report that increasing their Vitamin D has helped with other skin conditions, such as eczema. Other report that their sleep has improved. Still others reportedly have lost weight by simply increasing their Vitamin D. Although each of us are unique and different, so our reactions to improving our Vitamin D is different, the bottom line is that we all need adequate Vitamin D for good health.