I have a friend who started taking Guarana for energy and now has trouble sleeping and I noticed he is also a bit irritable. Does anyone know about this herb? Thanks.
Insomnia and irritability would not be surprising in someone taking this herb, because it contains caffeine and theophylline, compounds well known for producing those side effects.
Maybe reducing the dose and/or taking it earlier in the day would be helpful.
Guarana is very high in caffeine.
Also, it does not create "energy", it just makes you hyperactive and burns through your energy stores faster than normal. He'll crash when it wears off.