Vegetables especially green leafy kind - popular opinion is that they are least tasty of juices but do note they are still nutritionally very rich. So add a little lemon juice or dilute with cucumber juice or apple juice to make it tastier.
Recommended read from Mayo Clinic - Is vegetable juice as good as whole vegetables for meeting the number of recommended servings a day?
Published - July 2020
Excerpt …most adults should eat the equivalent of 2 1/2 cups of vegetables a day. The exact amount you need depends on your age, sex and level of physical activity. Any type of vegetable counts, whether it's raw, cooked, fresh, frozen or canned. Vegetable juice counts, too. Just make sure it's 100 percent vegetable juice and low in sodium…