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Subcutaneous is the most common route for general systemic delivery

Several factors may contribute to hair thinning during weight loss: Caloric deficit: Eating less means fewer nutrients are available for hair follicle function Protein intake changes: Hair is primarily made of protein (keratin), and not getting enough protein can affect hair growth Micronutrient shifts: Changes in iron, zinc, biotin, and vitamin D levels can influence hair growth Metabolic adaptation: Your body may temporarily prioritize essential functions over hair growth when calorie intake is reduced The good news is that this type of hair thinning is usually only temporary

Declarations Acknowledgement We would like to thank the Second Hospital of Nanjing, Affiliated to Nanjing University of Chinese Medicine, for their support

Most research-context protocols use 200-300 mcg once a night, by subcutaneous injection, about 30-60 minutes before bed on an empty stomach

R., & Madara, J

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