There are some products that are touted to increase oxygen to a plant's roots. Those products are primarily hydrogen peroxide, which when used may introduce some oxygen in the soil, but will most likely just foam up, degrade a little bit of organic matter, and disappear. In other words, they are not worth the money they cost. There are a lot of products being marketed but there is no research-based information supporting their use. There are no "plant vitamins" or other products that increase oxygenation of roots.
A good planting medium that is well drained with plenty of pore space should provide adequate aeration for a plant. Good watering practices also will prevent any problems. Do not allow plant containers to sit in water. Most plants do not like "wet feet." After watering plants, remove the standing water from the saucer.
