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Dear Customer
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Does thyroid issues or thyroid medication effect on hair quality and causes hair loss ?
hypothyroidism may cause hair thinning and dryness , but if you are treating it , then its not supposed to be a major cause of your medical condition 
- Its better to reconsult your hypothyroidsm doctor and redo thyroid test to make sure your treatment course is on the right path
What is the treatment of hair loss ?
1. consult a dermatology doctor to do the needed medical examnation and determine the treatment pathway
2. have a healthy diet and avoid stress 
3. if there is infection or disease in sculp or hair area , treat it first before starting hair loss treatment 
4. doctor may prescribe medication such as minoxidil and Finasteride
5. if medications didnt work out effectivily , you can do hair implantation 
Vitamins that help and increase hair quality ?
1. vitamin A
2. vitamin C
3. vitamin B12
4. vitamin E
5. zinc 
Causes of hair loss :
1. genetics 
2. stress
3. dont pay attention to hair hygine and hair care 
4. hypothyroidism
5. unhealthy diet and some medications side effect
6. low quality hair products 
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Kind Regards