Katia, yes DHEA has been helpful for some women definitely. Maca root also. It is considered safe as it's a root, an actual food. Like anything in life, you don't want to overdo it, but I have not read about any hard and fast contraindications to its use. It is reported to increase libido and response. A woman I know has used it with very good results. I'm presently trying it and so far, very good!
I tried both testosterone cream (local application) and T-Gel for 6 months and it did nothing for me but give me cystic zits and make me irritable.

It is not a cure-all for libido despite what you may read or see). For many women it works great, but not for all. A lot depends on the
balance between estrogen and testosterone. Testosterone (at least some of it) will convert to estrogen (via aromatase) in the body. I think this is what happened to me. I was on a low-dose patch so my estradiol levels were not very high. Adding in the T-gel just did not do anything for me except produce side effects.
In what little I've read and seen (others' experiences), your estradiol level needs to be high enough or in a certain range, for the testosterone to work properly. Perhaps that's one of the reasons it is not usually given to women who are not already on HRT. It's probably not as straightforward (unfortunately!) as just slapping on some gel on and hoping for the best.