Rhodiola is not a stimulant. It is an adaptogen, which means it fortifies the constitution against stress and allows more mental focus and thus achievement.
Over the course of a day, research has shown, various small stressors add up, so that by the end of the day, your mind is worn down and you are more easily distracted. The more bad stress you are subjected too, the less resilient you are toward additional stressors. This is why many people do their best work in the early part of the day, and get tired in the afternoon. This is also why telemarketers call you in the evening. For real. They know that statistically, people are more likely to succumb to telemarketing sales pitches when they are stressed out. They have done studies.
Anyway, I don't generally consume energy drinks at all, because I get a lot of exercise, and good stress like that counteracts bad stress (distress). But if I were to consume one, it would be this rhodiola based energy drink, called Brain Toniq. It has Rhodiola as the only active ingredient. And it is vegan.
Dietary vegetables are critical to human health.
One problem is that store bought vegetables lose nutrients with time, and because of shipping and storage, they are often depleted of nutrients.
It has been documented that frozen vegetables have a high nutritional content because they are flash frozen when the vegetables are fresh.
Locally obtained vegetables are also more nutritious, such as those obtained from a CSA or farmer's market.
However, frozen vegetables are convenient because of their ease of preparation. They can be rapidly steamed or boiled, and avoiding frying vegetables in oil (even healthy oil) is better for health.