In a video posted to the Chinese version of TikTok, Douyin, actress Guo Tong, 37, posted that she had started a course of injections which promised to reverse her white patches to their natural colour. 

Speaking in the video, she told fans that her pigmentation issues were not hereditary but related to her stressful lifestyle.

'My white hair isn't hereditary—it's due to irregular lifestyle, emotional stress, and a period of psychological pressure, which caused a lot of stress affecting my hair.

'I have now finished my tenth treatment. Many people ask me if it works. 

'Firstly, I was away on a business trip for about three weeks, visiting Beijing and then my hometown, so I missed three sessions. 

'Secondly, because I was filming, I had dyed my hair black, so it's not very obvious yet. 

'But the doctor has taken photos to track progress: some new roots are slowly growing, and one or two strands have turned from white to black at the root. I'm really happy about that.' 

She added that she felt compelled to seek treatment as it was causing her 'anxiety' due to the pressures she faces working as an actress, but has not disclosed how much it cost. 

'I thought, rather than worrying every day about whether my white hair will increase, it's better to leave it to the professionals and focus on what I need to do.

'If it works, I'll be happy to share my experience. If it doesn't, I consider it "dead money" or what people call a "wisdom tax"—money spent without a result. That's fine with me.' 

According to Yangtse News, the actress was treated at Shanghai Yueyang Hospital. 

One of the hospital's dermatologists told the outlet that the injections use a type of vitamin B12 known as adenosylcobalamin, which is a concept taken from Traditional Chinese Medicine (TCM), which believes that B12 stimulates melanin synthesis. 

Melanin is a natural pigment made by the body which influences the colour of our hair, skin and eyes.