Vitamin C is not effective when taken orally, so it is usually treated with large doses of intravenous drip, and the effect is still more obvious, and there is also the treatment of vitamin C directly into the skin with micro-needle or water light steam. Although vitamin C is an antioxidant and whitening drug, not all spots can be removed or have effects, such as freckles, brown spots and age spots, which are not very obvious.