Acemannan

What is Acemannan?

Acemannan is a bioactive polysaccharide found primarily in the inner leaf layers of the Aloe vera plant (Aloe barbadensis Miller). It is a long-chain molecule made up of mannose, glucose, and galactose – a so-called mannan –, to which most of the health-promoting properties of Aloe vera are attributed. Due to its high biological activity, Acemannan has been the subject of numerous scientific investigations for decades. Acemannan is being intensively researched, particularly in the areas of immunomodulation, wound healing, and antiviral effects. It is valued as a central component of high-quality Aloe vera preparations – for both internal and external use.

What health benefits does Acemannan offer?

Although Aloe vera is familiar to almost everyone, the active compound Acemannan has so far remained rather unknown. Research is increasingly engaging with this compound and attributes to it a large part of the medicinal potential of the Aloe vera plant. So far, its effects cannot be conclusively explained, which is why more research is necessary and the results are not readily transferable.

  • Strengthening the immune system: Acemannan activates macrophages, T cells, and other immune cells, which can lead to an improved defense against pathogens (1,2).
  • Promoting wound healing: The polysaccharide supports the regeneration of skin and mucous membranes and is used in ointments and gels for wound care (3,4).
  • Inflammation inhibition: Acemannan reduces the release of pro-inflammatory cytokines and thus has a supportive effect in chronic inflammatory processes (5).
  • Gut health: Due to its mucosa-protecting properties and its potentially positive effects on the microbiome, Accemannan is an interesting active compound for gut health (5,6,7).

How does Acemannan work in the body?

The exact effect has not yet been conclusively investigated; however, the following mechanisms of action are likely involved in the processes behind its effects:

  • Immunomodulation: Acemannan stimulates immune cells such as macrophages to produce interleukin-1 and -6 as well as TNF-α – messenger substances that are essential for the immune response (8).
  • Cell regeneration: It supports fibroblast activity and collagen synthesis – two key mechanisms of wound healing (8).
  • Antiviral protection: Acemannan can inhibit the uptake and replication of viruses such as herpes simplex and HIV in vitro (8).
  • Antioxidant effects: It helps reduce oxidative stress and protects cells from free radicals (8).

Are there side effects or risks?

  • Well tolerated: Acemannan is generally considered safe and well tolerated.
  • Quality-dependent: The biological activity depends heavily on the processing and stability of Aloe vera products – heat or long storage can destroy Acemannan.
  • Caution with autoimmune diseases: Due to its immune-stimulating effect, a physician should be consulted in the case of autoimmune diseases.

In general, intake should take place under medical supervision until all mechanisms of action have been conclusively investigated.

Conclusion

Acemannan is the heart of the Aloe vera plant – a highly effective substance with immune-strengthening, anti-inflammatory, and wound-healing-promoting effects. As a natural active compound, it shows promising potential for a wide range of health applications and is rightly regarded as one of the main reasons for the therapeutic popularity of Aloe vera. However, more research is necessary to conclusively understand its effects.

Sources:

  1. Murray, M. T. (2020). Aloe vera (Cape Aloe). In J. E. Pizzorno & M. T. Murray (Eds.), Textbook of Natural Medicine (5th ed., pp. 421–428.e2). Churchill Livingstone. https://doi.org/10.1016/B978-0-323-43044-9.00052-2
  2. Zhang, L., & Tizard, I. R. (1996). Activation of a mouse macrophage cell line by acemannan: the major carbohydrate fraction from Aloe vera gel. Immunopharmacology, 35(2), 119–128. https://doi.org/10.1016/s0162-3109(96)00135-x
  3. Xing, W., Guo, W., Zou, C. H., Fu, T. T., Li, X. Y., Zhu, M., Qi, J. H., Song, J., Dong, C. H., Li, Z., Xiao, Y., Yuan, P. S., Huang, H., & Xu, X. (2015). Acemannan accelerates cell proliferation and skin wound healing through AKT/mTOR signaling pathway. Journal of dermatological science, 79(2), 101–109. https://doi.org/10.1016/j.jdermsci.2015.03.016
  4. Jettanacheawchankit, S., Sasithanasate, S., Sangvanich, P., Banlunara, W., & Thunyakitpisal, P. (2009). Acemannan stimulates gingival fibroblast proliferation; expressions of keratinocyte growth factor-1, vascular endothelial growth factor, and type I collagen; and wound healing. Journal of pharmacological sciences, 109(4), 525–531. https://doi.org/10.1254/jphs.08204fp
  5. Li, L., Xu, W., Luo, Y., Lao, C., Tong, X., Du, J., Huang, B., Li, D., Chen, J., Ye, H., Cong, F., Guo, X., & Li, J. (2022). Aloe polymeric acemannan inhibits the cytokine storm in mouse pneumonia models by modulating macrophage metabolism. Carbohydrate Polymers, 297, 120032. https://doi.org/10.1016/j.carbpol.2022.120032
  6. Quezada, M. P., Salinas, C., Gotteland, M., & Cardemil, L. (2017). Acemannan and Fructans from Aloe vera (Aloe barbadensis Miller) Plants as Novel Prebiotics. Journal of agricultural and food chemistry, 65(46), 10029–10039. https://doi.org/10.1021/acs.jafc.7b04100
  7. Sadgrove, N. J., & Simmonds, M. S. J. (2021). Pharmacodynamics of Aloe vera and acemannan in therapeutic applications for skin, digestion, and immunomodulation. Phytotherapy research : PTR, 35(12), 6572–6584. https://doi.org/10.1002/ptr.7242
  8. Pal, S., Raj, M., Singh, M., Saurav, K., Paliwal, C., Saha, S., Sharma, A. K., & Singh, M. (2024). The Effect of Aloe vera on Skin and Its Commensals: Contribution of Acemannan in Curing Acne Caused by Propionibacterium acnes. Microorganisms, 12(10), 2070. https://doi.org/10.3390/microorganisms12102070