The Mito-Essence has 10 mg of Luteolin. The latter is sold as a supplement by Longlifenutri in 100mg capsules. Would using this higher dose of this ingredient be safe and beneficial?

This would be both safe and beneficial. One could go even higher and do so safely. Here again, is an example of an antioxidant that has been identified and looked at scientifically and found to be one of the most potent available. And, in particular, because it passes the blood brain barrier, it is especially advantageous for maintaining neural function and protection, especially from the possible downside of hyper-immune responses to chronic infection as well as chemical insults from ingestion, inadvertently, of deleterious substances in foods. Whether naturally present because of geographic features such as poor-quality soil, or introduced as additives because they have some commercially beneficial property for stabilization or other advantages, their toxicity is not yet appreciated and it represents a net negative.