Designed for specific purposes such as post-workout rehydration with electrolytes (sodium, magnesium, potassium) or social relaxation without the "hangover" effects of alcohol.
Functional beers aim to be "more than a substitute" by adding active benefits to your daily routine:
If you are looking for specific "drinkable" functional beers to try, several brands are leading the market: Multisensory Science Behind Functional Beers - impossibrew