This can be provided by your GP.
endo approves it bearing in mind your pre-existing health conditions.
Consider extensions if you can afford them
However, you need to be budgeting for quite a substantial amount of money every 6 to 7 weeks.
This is not so good if your income isn’t high.
Tresemme is over-rated and my hairdresser says it can damage the hair.
Finally, to ensure maximal richness and also make it look thicker, color your hair with brunette tones
Avoid blondes which bleach out color and can make hair brittle.