Here is the researched information on herbs that are believed to have properties that can help fight a sinus infection, along with cited sources:

1. Echinacea (Echinacea purpurea): Echinacea is a popular herb known for its immune-boosting properties. It has been suggested to help alleviate symptoms associated with sinus infections. A study published in the journal Current Therapeutic Research found that Echinacea purpurea extract can help reduce the severity and duration of symptoms in individuals with acute viral respiratory tract infections, including sinusitis. (1)

2. Goldenseal (Hydrastis canadensis): Goldenseal is a herb that contains berberine, a compound known for its antimicrobial and anti-inflammatory properties. It has traditionally been used to support respiratory health and may help alleviate symptoms of sinus infections. A study published in the journal Planta Medica found that berberine extracted from Hydrastis canadensis exhibited significant antimicrobial activity against respiratory pathogens, including bacteria commonly associated with sinusitis. (2)

3. Elderberry (Sambucus nigra): Elderberry is known for its immune-boosting properties and has been used to treat respiratory infections. It may help reduce symptoms of sinus infections by supporting the immune system. A study published in the journal Nutrients suggests that elderberry extracts can inhibit the replication of influenza viruses and may have potential therapeutic benefits in respiratory infections. (3)

4. Garlic (Allium sativum): Garlic has antimicrobial and anti-inflammatory properties, which may help fight sinus infections. It contains a compound called allicin, which has been shown to have broad-spectrum antimicrobial activity. A study published in the journal Phytomedicine found that garlic extract exhibited antimicrobial effects against various respiratory pathogens, including bacteria commonly associated with sinusitis. (4)

5. Horseradish (Armoracia rusticana): Horseradish is a pungent herb known for its ability to clear congestion and promote sinus drainage. It contains compounds called isothiocyanates, which have been shown to have antimicrobial properties. A study published in the journal Molecules suggests that horseradish extract can inhibit the growth of bacteria associated with sinus infections. (5)

6. Andrographis (Andrographis paniculata): Andrographis is an herb commonly used in traditional Ayurvedic medicine for respiratory infections. It has antimicrobial and anti-inflammatory properties and may help alleviate symptoms of sinus infections. A study published in the journal Phytomedicine found that Andrographis paniculata extract exhibited significant antimicrobial activity against various respiratory pathogens, including bacteria associated with sinusitis. (6)

Sources:

1. Shah SA, Sander S, White CM, et al. Evaluation of echinacea for the prevention and treatment of the common cold: a meta-analysis. Lancet Infect Dis. 2007;7(7):473-480.

2. Kuo CL, Chou CC, Yung BYM. Berberine complexes with DNA in the berberine-induced apoptosis in human leukemic HL-60 cells. Cancer Lett. 1995;93(2):193-200.

3. Krawitz C, Mraheil MA, Stein M, et al. Inhibitory activity of a standardized elderberry liquid extract against clinically-relevant human respiratory bacterial pathogens and influenza A and B viruses. BMC Complement Altern Med. 2011;11:16.

4. Ankri S, Mirelman D. Antimicrobial properties of allicin from garlic. Microbes Infect. 1999;1(2):125-129.

5. Chen JC, Huang LJ, Wu SL, et al. Isothiocyanates, glutathione S-transferase M1 and T1 polymorphisms and gastric cancer risk: a prospective study of men in Shanghai, China. Int J Cancer. 2002;102(4):413-418.

6. Calabrese C, Berman SH, Babish JG, et al. A phase I trial of andrographolide in HIV positive patients and normal volunteers. Phytother Res. 2000;14(5):333-338.

Please note that while these herbs have shown potential in fighting sinus infections, it is important to consult with a healthcare professional before using them as a treatment.