Slightly off-topic, but related to a vitamin mentioned in here:<p>For Vitamin D, I read a post on Reddit a while back on a subreddit that was intended for older people. Someone asked a question along the lines of 'what is something you wish you were told earlier' and at least one person mentioned Vitamin D deficiency.<p>They said that for most of their life they were deficient and that it had a significant impact on their life-long depression, and their stress and focus if I recall correctly. Once they began taking Vitamin D supplements it drastically changed everything and completely changed their mood: it turned out that they had Vitamin D absorption issues and never picked up on it. They said they take 12,000 IU/day, now, and it has changed their life.<p>Most Vitamin D supplements seem to come (in Australia at least) at anywhere from 300 IU to 1000 IU. I looked into safe Vitamin D levels and it appears that you can take up to 50,000 IU a day before you start seeing adverse affects, and just being in direct sunlight for an hour or so is about 15,000 IU for my skin type.<p>With this in mind, I've began taking 7,000 IU a day (I get about an hour of direct sunlight a day at least on most days). I can't say for sure that it has an effect on my mood, but on the days where I feel a bit worse than usual it's usually because I haven't taken my supplement stack for a couple of days (i.e ran out and hadn't yet bought supplies).