Artificial sweetners are dangerous for parrots.
Our exotics veterinarian shares the foods and household products that can be poisonous for birds. See which items make the list here.
www.vetstreet.com
As stated below , a random lick of cap is ok. But don't offer it to term for them to drink.
I've developed a late life allergy to artificial sweetners ( seems like all of them)( vomiting)
my gi specialist said all artificial sweetners should be banned..said they also cause liver damage, linked with cancer triggers autoimmune conditions.. so I hope you might limit your exposure to them too.