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Normal B12 ranges typically fall between 200-900 pg/mL, though functional B12 status is better assessed by methylmalonic acid (MMA) and homocysteine levels

A cross-sectional survey with long-term follow-up

Age Range: Adults

-Fights the visible signs of fine lines and wrinkles helps impart essential moisture to the skin and restoring vital skin radiance

The pragmatic clinical trial was approved by the medical ethics committee of Union Hospital, Tongji Medical College, Huazhong University of Science and Technology (approval number 2023 0353) and was registered in the Chinese Clinical Trial Registry (www.chictr.org.cn

Additionally, the use of protease cleavage sites between the GST tag and the target protein allows for removal of the tag after purification if necessary