If your hamster has hair loss this could be a symptom of a disease or parasites.
Fungi.
Answer If the hamster is sleeping in a tube, and she wees in the tube, then it may cause the pee to stick to the hair on the bum and can cause mild hair loss. If this is the case, remove the tube and let the hamster create a bed elsewhere.
If your dwarf hamster has signs of hair loss lots or itching and green hammy manure then these signs may be theresult of mites
Good nutrition can definitely help prevent some hair loss. You can find a wealth of information at http://www.mayoclinic.com/health/hair-loss/DS00278
It's best to consult a veterinarian to determine the underlying cause of your hamster's hair loss. In some cases, providing a balanced diet with adequate nutrients may help improve your hamster's health and fur condition, but adding vitamins to the water without professional advice could be harmful.
I don't know how you mean losing hair, if sheding is what your talking about, I'm not sure if the hamster might be sick or not, but if it is coming out in clumps and/or leaving red patches or irritated skin then I'd take Mr. Hamster directly to a vet. ASAP It could be something simple but I've found from my own experience, if someting is moving quickly with your animal, you need to move quickly.
You can find online information on hair loss for women at the following sites. www.streetdirectory.com/.../vitamins-for-hair-loss-women-ece ,www.boots.com Pharmacy & Health Health shop
Keep your head out of it.
that will proberly be a Syrian Hamster or the Golden Hamster.
http://www.hairenergizer.com/Vitamins-For-Hair-Loss-s/13.htm sells vitamins to prevent hair loss, along with a combination of a B12 vitamin. Also, you can find great information on which vitamins will slow hair loss at http://www.holisticonline.com/Remedies/Hair/hair_loss-nutrition.htm
because a hamster's skin is pink
They do not make supplements to regain your hair. However, there is an alternitive. You could look into some hair loss restoration. This will help you to grow your hair back.