Is it true that vitamin C causes dark spots?

Ultraviolet (UV) rays are the cause of sunburn.
 
UVA, which gradually increases from early spring and destroys collagen, peaks from April to August, while UVB, which produces melanin, peaks from May to August. There is no need to wait for UV protection this season. I want to do as much care as possible to suppress the damage that my skin receives as much as possible.
Well, everyone says, "If you apply a cream containing vitamin C and expose it to direct sunlight, it will become a stain." Have you ever seen or heard of such information?
In short, this information is incorrect.
 
"Vitamin C does not cause spots". 
 

Misconceptions born from the association of “psoralen = vitamin C”

So how did this misunderstanding arise?
 
There is a substance called a psoralen. This substance is found in large amounts in citrus fruits such as grapefruit, oranges, and lemons, but it is phototoxic (a property that reacts to ultraviolet rays and affects the skin), causing spots and inflammation when exposed to sunlight. make it easier to cause skin problems.
 
Perhaps we have an image that "citrus fruits = vitamin C", so the association of "psoralen → citrus fruits → vitamin C" has led to the misunderstanding (misunderstanding) that "vitamin C is the cause of dark spots". I guess.
 
By the way, phototoxicity of psoralen appears not only when it is applied directly to the skin with oil etc., but also when it is ingested from food.
When ingested from food, psoralen travels throughout the body in about two hours in the bloodstream. If you apply or eat anything containing psoralen, avoid exposure to the sun for several hours while the phototoxic effects remain.
 

Tips to prevent and lighten blemishes

Applying cosmetics containing vitamin C or taking vitamin C will not increase age spots.
The first thing that is important is to reduce your chances of being exposed to sunlight using things like parasols.
And to maintain a good nutritional balance in the body.
 
Active oxygen generated by ultraviolet rays acts as a switch for the synthesis of melanin, which is the cause of age spots.
When the body's nutritional balance is maintained, antioxidants in the body work to remove excess free radicals.
In addition, macrophages, which are immune cells, prey on melanin and work to break it down.
Aim to build a body with proper nutrition and immunity through a regular lifestyle and eating habits.
 
(reference)
・Akira Murata “New Vitamin C and Health: 21st Century Healthcare” (2012)
-YANAGISAWA Atsuo “Cancer therapy that does not require production: High-concentration vitamin C drip therapy” (2017)
・“Analysis of furocoumarins in essential oils” Journal of Aromatherapy, 17(1), 2016

Recommended articles

・ What are the effects of taking too much vitamin C? What is the recommended daily intake?
・ What does vitamin C feel like? ``Immunity'', ``Fatigue recovery/fatigue prevention'', and ``Skin effects'' were ranked high.
・ There is a huge gap in the perception of vitamin C between doctors and consumers. Less than 5% of people use a method of intake that doctors consider effective.
・ Is it better to take vitamin C for health and beauty? Recommended food
・ Vitamin C awareness survey (questionnaire) results. Are men and women completely different? “What to expect from vitamin C”

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