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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

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

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If not, 6 mm or 8 mm needles will also work