**10. Conclusions**

The European oreganos are *Origanum* spp. have been considered the best ones because they have a higher content of carvacrol; however, in tropical America and Africa ecosystems, chemotypes with a high thymol content, such as *Lippia Organoides* spp., it has been shown that they have functional effects on poultry health and production.

Oregano essential oils have many benefits for poultry, including strengthening the immune system, inhibiting pathogenic bacterial growth, improving intestinal integrity, improving egg quality, and promoting growth performance. It is important to note that the effectiveness of oregano may vary depending on the dosage and form of administration.

*Oregano Essential Oils as a Nutraceutical Additive in Poultry Diets DOI: http://dx.doi.org/10.5772/intechopen.113313*

Our studies found that *Lippia origanoides* Kunth is a promising species due to its high thymol content (close to 80%), low variation in active compounds, and low percentage of precursors. It also demonstrated strong antimicrobial activity against pathogenic bacteria and the lowest antimicrobial activity against beneficial bacteria. Additionally, the OEO supplementation of coccidia-challenged broilers improved their productive performance, showing that *L. Origanoides* EO high thymol can be a viable natural additive to produce chicken meat.

Consequently, OEO has potential as a natural alternative to antibiotics for improving intestinal health and barrier function in poultry. However, more research is needed to fully understand the mechanisms underlying these effects and determine the optimal dosage and duration of OEO supplementation.

In human health, it is necessary to investigate other applications of the OEO for anticancer, anti-inflammatory, and antidiabetic properties.
