Yes — fresh mint leaves are safe in normal amounts. Avoid concentrated mint oils.
Keeper's noteFresh leaves only — avoid concentrated mint oils, menthol products, and mint-flavored anything. A sprig in the water dish makes 'spa water' some birds love.
Why mint is good for parrots
Fresh spearmint and peppermint leaves are safe for parrots in the quantities a bird would actually eat. The caution applies to essential oils and extracts — menthol in concentrated form is far too strong for avian respiratory systems and should never be used around birds.
How to serve it
A few fresh washed leaves at a time.
Grow a pot — mint is unkillable and regrows fast.
Never essential oils, menthol rubs, or flavored candy.