These can be smoothies, bars, drinks, supplements, etc.
Is there something specific you look for (ex. price, ingredients, specific nutrients etc.)?
Is there a brand you like / avoid (ex. soylent, huel, hol food, etc.)
Edit:
I definitely don’t recommend fully replacing your diet with them. I know some people use them instead of other processed food / fast food / skipping meals entirely, and that’s the use case I had in mind for myself
We have evolved for millions of years to eat real, natural, organic foods that not only provide the nutrients we need, but just as importantly, bacteria to maintain a healthy gut biome. Meal replacements is putting your health in the hands of a for profit corporation that may have the best interests, but also, many have shareholders who demand a return. Who are you going to trust. Foods from Mother Nature that have no processing or something made in a factory where you have no way to verify how it was actually made?
I have tried many alternative foods, some claiming optimal health, but only real unprocessed foods have given me the health others cannot match.