The vitamin I take is Yuhan Corporation's Vitamin C 1000mg.

The prices of each product vary greatly, making it difficult to choose. Luckily, a friend once gave me this product as a gift, so I've been taking only this ever since. First of all, I like that it's affordable. Also, I trust Yuhan Corporation, which is why I chose this product. Vitamin tablets are generally large, so it's not easy to swallow them all at once, which can be a bit inconvenient. When it's too difficult to swallow, it's good that I can split them in half and take them. Still, perhaps because it's not easy to eat vegetables regularly, I feel a sense of obligation to take vitamin C every day. I've heard that taking vitamin C when you're tired can reduce fatigue. Maybe because of that, I've been sleeping a bit better lately. I used to have severe insomnia, but these days I sleep quite well. Of course, exercise and mind control are also factors, but I think this vitamin C has played a part too.