Those links are to studies which do not support the 40% claim. They are basic science research about vitamin interactions in the human body. Please consider that if you can't find studies showing "widespread deficiencies," then perhaps they don't exist.
Those links are to studies which do not support the 40% claim. They are basic science research about vitamin interactions in the human body. Please consider that if you can't find studies showing "widespread deficiencies," then perhaps they don't exist.