Large pharmaceutical companies have seen a boost in their sales and share prices from the recent popularity of collagen, a product that is believed to smooth and firm skin, and help people look young.
However, late last month, some of these listed companies saw a significant decline in their share prices.
On May 23, the share price of Shenzhen-listed Baotou Dongbao Bio Tech Co, which has a national patent for soluble collagen, closed down 3.86 percent at 11.2 yuan ($1.83).
The slide was caused by controversy surrounding collagen, as some medical experts said on their Sina Weibo that there is no difference between collagen and ordinary food in terms of protein content.
It has led to concerns that the health and beauty claims about collagen products could be false.
Just a scam?
On May 19, a doctor at the burn surgery unit of Beijing Jishuitan Hospital wrote on his Sina Weibo that "all the orally ingested collagen products are a scam, no matter how effective they claim to be."
The doctor, who did not reveal his name, explained that after digestion, collagen disintegrates into amino acids, which are also found in the proteins in common food such as meat, eggs and soy beans.
"The best result you can hope for after eating collagen is no effect," the doctor said. "It would be more dangerous if you found the collagen effective, because then estrogen must have been added to the product."
A declining level of estrogen will lead to thinning of the skin, as well as wrinkles and dryness. But higher levels of estrogen can potentially cause breast cancer.
The doctor's claim was soon echoed by several nutritionists and other doctors online. Some even warned that consuming collagen could harm kidney function.
Soon after, companies producing or selling collagen started to be affected.
Dongbao Bio released a statement on its official website on May 30, citing a doctor who said that collagen's effects have been widely recognized in the US, EU, Japan and China, and adding that it can offer health benefits.
"Collagen's popularity in China shows that it meets consumers' demand for being young, internally and externally," reads a statement from Lumi, a collagen producer.
Zuo Wenjun, a veteran plastic surgeon and deputy head of Shanghai Time Plastic Surgery Hospital, told the Global Times Tuesday that oral collagen supplements can provide amino acids and peptides, which are necessary components for keeping skin elastic.
"It is like eating pork trotters in a drink or powder form, but not as greasy. Some people like oral collagen products because they don't want to gain weight," said Zuo, noting that the product is not always as effective as consumers expect.
Zhu Jiajia, a 27-year-old office manager based in Shanghai, who has been drinking collagen beverages for two years, told the Global Times that she thinks collagen can help her resist the aging process.
"Many stars look young and they said they have used the collagen products," said Zhu.
But Zhu noted that some of her friends are more wary, and did not feel anything after drinking collagen products.
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