Like Neckhammer said, everything in nature works in synergy. When we start taking isolated vitamins (which don't exist in nature), we exacerbate or create deficiencies because certain vitamins and minerals deplete others. They have to be in balance. Vitamin D is one of the scarier ones to me because Vitamin D is not typically ingested orally - it is made by your body when in contact with sunlight.
These are all short term studies. Vitamin D supplementation is a relatively new fad. Let's see what happens 30 years from now to the people that supplement every day. 50,000 IU may be the threshold for toxicity...in what? A week? Short term megadosing? The issue is over decades. Similar to grain and vegetable oil, the toxicity becomes an issue after years or decades because the toxins build up in your tissue until they become a problem. No one is going to develop a disease eating a bowl of oatmeal 3 times a day for a week. But do it for 20 years and see what happens. The same thing may hold true for these isolated fat soluble vitamins.
If you want to be a guinea pig for a new supplement, be my guest. I will take the cautious approach and get my digestible vitamins and minerals through a nutrient-dense, low-toxin diet and get my Vitamin D from the sun.
Last edited by ChocoTaco369; 01-16-2013 at 08:40 PM.
Don't put your trust in anyone on this forum, including me. You are the key to your own success.