Supplements
Supplements [10] can help strengthen your immune system and allow your body to produce more white blood cells. Vitamin D supplements can be good for the health and help regulate the immune system. Your body makes this vitamin naturally from sunlight, so speak to your doctor about whether to take it or not.
Oregano oil is sold as a supplement and is often marketed for its benefits to the immune system. This is because the oil has strong antimicrobial properties. It can help fight infections and help your body replace lost white blood cells faster.
Conclusion
When trying to raise your blood count, doctors may recommend a combination of treatments instead of one. The body self-regulates its leukocytes levels. So if you eat a healthy diet and maintain good hygiene, you often will not need to concern yourself with increasing your white blood cell counts.
References
[1] https://www.medicalnewstoday.com/articles/265373#neutropenia_treatments
[2] https://www.cancer.org/treatment/treatments-and-side-effects/physical-side-effects/low-blood-counts/neutropenia.html
[3] https://www.choosingwisely.org/wp-content/uploads/2018/02/Drugs-To-Boost-White-Blood-Cells-For-Cancer-Patients-On-Chemotherapy-ASCO.pdf
[4] https://www.medicalnewstoday.com/articles/265373#neutropenia_treatments
[5] https://draxe.com/health/leukopenia/
[6] https://draxe.com/health/leukopenia/
[7] https://www.ncbi.nlm.nih.gov/pubmed/29517845
[8] https://www.stylecraze.com/articles/how-to-increase-white-blood-cells/
[9] https://draxe.com/health/leukopenia/
[10] https://www.ucsfbenioffchildrens.org/conditions/neutropenia