Ferrum Phos
Banned
Yes, as vitamin D(3), along with omega-3 fatty acids and the B vitamin family, are required for the synthesis of serotonin. I don't know if you're familiar with SAD (Seasonal Affective Disorder) - the major depression that sets in during the winter months due to the sun's inability to reach the right angle for production, and the UV index being too low - but it has been linked with low levels of vitamin D in the body, which plummet during the winter months. As an aside, it's also one of the most important nutrients for the prevention of many different types of cancers, due to its antitumor and antimetastatic properties.Is a lack of vitamin d3 linked to depression?
(Seasonal Affective Disorder: An Overview of Assessment and Treatment Approaches)
(Vitamin D as a promising anticancer agent)
(Vitamin D and Cancer)
The darker one's skin, the longer one needs to be out in the sun for proper vitamin D synthesization (assuming one's even in a state with the right UV index). In states like California, Arizona, Texas, and New Mexico, production of vitamin D from sunlight can take place most months out of the year, even during the early, early winter months. The colder, northern and northeastern states that see lots of rain and snow, like Washington, Michigan, and New York, for example, forget it - darker skinned people will never receive the right UV index for proper production from the sun alone, and at that point, supplementation is required.
The rule of thumb is: when your shadow is shorter than your stature, the sun is at the right angle for the cholesterol on your skin to start synthesizing vitamin D as soon as the sunlight hits it, which usually takes place between the hours of 11 and 3, roughly. Since most people work indoors, leaving the house before the sun is high, and getting home when the sun is setting, you can see why most people are deficient, regardless of their hue.
(Vitamin D and the omega-3 fatty acids control serotonin synthesis and action, part 2: relevance for ADHD, bipolar disorder, schizophrenia, and impulsive behavior)
(Vitamin D and Depression: A Systematic Review and Meta-Analysis Comparing Studies with and without Biological Flaws)