Witch Hazel

1. What conditions has Witch Hazel been studied for?

• Acne-related inflammation (mechanistic, in vitro): Witch hazel bark glycolic extract (HVE) tested in human keratinocytes (HaCaT) stimulated with Cutibacterium acnes or TNF-α, measuring inflammatory cytokines (e.g., IL-6, IL-8) and signaling (NF-κB).

• General skin inflammation/oxidative stress (in vitro): Witch hazel extracts/formulations tested in primary human skin fibroblasts for antioxidant/anti-inflammatory effects (e.g., IL-8 after hydrogen peroxide exposure) and anti-collagenase/anti-elastase activity.

• Dandruff / scalp conditions (in vitro; partial abstract): Hamamelitannin (a witch hazel constituent) evaluated alongside antifungals against Malassezia spp. and Staphylococcus spp.; another partial abstract describes a regimen including witch hazel in a scalp serum.

• Staphylococcal infections/pathogenesis (in vitro): Witch hazel extract “whISOBAX (WH)” and/or hamamelitannin studied for effects on bacterial growth, biofilm formation, and toxin production; also evaluated for synergy with antibiotics (checkerboard/isobologram methods).

• Colon cancer (in vitro): Witch hazel tannins (hamamelitannin, pentagalloylglucose, and a proanthocyanidin-rich fraction) tested against HT29 colon cancer cells and normal colonocytes.

• Hemorrhoidal disease symptoms (human prospective survey, combination product): A rectal ointment containing sucralfate plus herbal extracts including witch hazel leaf (hamamelis) assessed for symptom frequency and quality of life over ~14 days.

• Broader “skin benefits” of a witch hazel constituent (review-level): Gallic acid (present in witch hazel among many plants) reviewed for dermatologic uses (e.g., atopic dermatitis, hyperpigmentation, wound healing) and formulation considerations.

• Acne/AD/psoriasis (systematic review of CAM): Witch hazel is within the broader CAM landscape, but the abstract does not specify witch hazel-specific trials; it concludes overall evidence is insufficient for CAM in these diseases.

2. Does it work in treating those conditions? Summarize the evidence.

• Acne inflammation (in vitro only): HVE reduced C. acnes-induced IL-6 release in HaCaT keratinocytes (IC₅₀ 136.90 μg/mL) and partially impaired NF-κB activation. However, it showed no antibacterial or antibiofilm activity against C. acnes in the same work. This supports an anti-inflammatory mechanism relevant to acne, but does not demonstrate clinical acne improvement.

• General skin inflammation/oxidative stress (in vitro): In primary human skin fibroblasts, witch hazel-containing samples significantly decreased hydrogen peroxide–induced IL-8 compared with control (p<0.05). Notably, a witch hazel distillate showed no activity in collagenase or trolox-equivalent antioxidant assays, suggesting activity depends strongly on the preparation/extract composition.

• Dandruff (in vitro; incomplete details): Hamamelitannin was tested against Malassezia and Staphylococcus species, and another abstract discusses shampoo exposure conditions and formulation effects. The provided text supports that witch hazel constituents are being evaluated, but the abstract excerpt does not provide clear efficacy outcomes for hamamelitannin versus dandruff organisms.

• Staphylococcal pathogenesis (in vitro): WH extract (high phenolic content; ~75% hamamelitannin with traces of gallic acid) inhibited growth of multiple Gram-positive and Gram-negative bacteria with variable efficacy and was studied for synergy with antibiotics. Separate text indicates witch hazel/green tea extracts can affect staphylococcal growth/biofilm/toxin production, but the excerpt is truncated, limiting conclusions about magnitude and clinical relevance.

• Colon cancer (in vitro): Witch hazel tannins reduced viability and induced apoptosis/necrosis and S-phase arrest in HT29 colon cancer cells. Hamamelitannin was most efficient and, at growth-inhibiting concentrations, did not harm normal colonocytes (NCM460), whereas pentagalloylglucose inhibited both cancer and normal cell growth. This is promising mechanistic evidence, but it is not clinical evidence of cancer prevention or treatment.

• Hemorrhoids (human survey; combination product): A sucralfate + herbal extract ointment (including witch hazel leaf) improved HEMO-FISS-QoL scores over ~13 days (mean change -10.41; 95% CI -11.95 to -8.86; P<0.001) and reduced symptom frequency; 39.4% reported no symptoms at end. Because this was a prospective survey without a randomized control and used a multi-ingredient formulation, the specific contribution of witch hazel cannot be isolated.

• CAM for acne/AD/psoriasis (systematic review/meta-analysis): The review concluded there is insufficient evidence to support efficacy or recommendation of CAM for acne, AD, and psoriasis overall, citing heterogeneity and design limitations. This weakens confidence in CAM broadly, but does not directly refute witch hazel specifically.

3. What health benefits does it have?

• Anti-inflammatory effects on skin cells (preclinical): Witch hazel bark extract reduced pro-inflammatory cytokine release (IL-6, IL-8) in keratinocytes/fibroblasts under inflammatory/oxidative stimuli, with partial NF-κB pathway involvement in the keratinocyte model.

• Antioxidant-linked activity (preclinical): In the acne-inflammation model, HVE’s effects included partial antioxidant mechanisms (e.g., VEGF inhibition noted in the abstract). In fibroblasts, extracts/formulations protected against hydrogen peroxide–induced inflammatory response.

• Potential anti-aging/skin matrix support signals (preclinical, preparation-dependent): In fibroblast assays, plant extracts were assessed for anti-collagenase and anti-elastase activity; however, witch hazel distillate specifically showed no activity in collagenase and trolox-equivalent assays, highlighting that benefits may depend on using polyphenol-rich extracts rather than distillates.

• Antimicrobial/anti-virulence potential (preclinical): WH extract and hamamelitannin are described as inhibiting staphylococcal pathogenesis (biofilm formation/toxin production) and WH inhibited growth of multiple bacteria in vitro; synergy with antibiotics was investigated.

• Potential anticancer activity (preclinical): Witch hazel tannins (especially hamamelitannin) showed selective cytotoxicity toward colon cancer cells versus normal colonocytes in vitro, with apoptosis/necrosis and cell-cycle effects.

• Symptom relief in hemorrhoidal disease (clinical signal, combination product): In a real-world prospective survey, a sucralfate + herbal ointment including witch hazel leaf was associated with improved quality of life and reduced hemorrhoid symptom frequency over ~2 weeks.

• Benefits attributed to constituents found in witch hazel (review-level): Gallic acid is reviewed as having antioxidant, anti-inflammatory, antimicrobial, and skin-related benefits (including use as an adjuvant/substitute for hydrocortisone in children with atopic dermatitis in some formulations), but this evidence is not specific to witch hazel as the source.

4. Does it have any downsides or side effects?

• May not address acne bacteria directly: In the keratinocyte acne-inflammation study, witch hazel bark extract reduced inflammatory signaling but showed no antibacterial or antibiofilm activity against C. acnes. For acne, this implies it may help inflammation but not the microbial component (based on this model).

• Preparation matters; some products may be weak: Witch hazel distillate showed no activity in collagenase and trolox-equivalent antioxidant assays in fibroblast testing, suggesting some common forms may have limited measurable antioxidant/anti-matrix-enzyme effects compared with other extracts.

• Allergic reactions reported for related compounds: The gallic acid review notes that despite generally low systemic toxicity and USFDA GRAS status for gallic acid, few cases of gallate-induced skin allergy have been reported in humans. This is not witch hazel-specific, but is relevant because witch hazel can contain gallic acid and related phenolics.

• Evidence limitations and uncertainty: Much of the witch hazel evidence here is in vitro (cell culture) or from non-randomized real-world surveys with combination products, so effectiveness and tolerability in real patients can differ from these models.

5. Is it beneficial or harmful for any genetic variations (pharmacogenomics)?

The provided abstracts do not report pharmacogenomic findings for witch hazel, hamamelitannin, proanthocyanidins, or gallic acid (e.g., effects modified by specific genetic variants in metabolism, inflammatory signaling, skin barrier genes, or microbiome-related host genetics). Therefore:

• No evidence from these abstracts that witch hazel is specifically beneficial or harmful for any known genetic variation.

• Given the mechanisms discussed (e.g., partial NF-κB pathway effects; antioxidant-related effects), it is biologically plausible that host genetics could influence response, but this remains unproven in the cited material.

References

1. Anti-Inflammatory and Anti-Acne Effects ofHamamelis virginianaBark in Human Keratinocytes
   Stefano Piazza, Giulia Martinelli, Urska Vrhovsek, Domenico Masuero, Marco Fumagalli (2022)
2. New Perspectives on the Efficacy of Gallic Acid in Cosmetics & Nanocosmeceuticals.
   Barkat Ali Khan, Tariq Mahmood, Farid Menaa, Yasser Shahzad, Abid Mehmood Yousaf, Talib Hussain, Sidhartha D Ray (2018) - Current pharmaceutical design
3. Improved Anticancer Effect of Magnetite Nanocomposite Formulation of GALLIC Acid (Fe₃O₄-PEG-GA) Against Lung, Breast and Colon Cancer Cells.
   Raihana Rosman, Bullo Saifullah, Sandra Maniam, Dena Dorniani, Mohd Zobir Hussein, Sharida Fakurazi (2018) - Nanomaterials (Basel, Switzerland)
4. Antioxidant and potential anti-inflammatory activity of extracts and formulations of white tea, rose, and witch hazel on primary human dermal fibroblast cells.
   Tamsyn Sa Thring, Pauline Hili, Declan P Naughton (2011) - Journal of inflammation (London, England)
5. Complementary and alternative medicine treatments for common skin diseases: A systematic review and meta-analysis.
   Virginia A Jones, Payal M Patel, Claire Wilson, Hongnan Wang, Kurt A Ashack (2021) - JAAD international
6. In-Vitro Inhibition of Staphylococcal Pathogenesis by Witch-Hazel and Green Tea Extracts.
   Reuven Rasooly, Adel Molnar, Hwang-Yong Choi, Paula Do, Kenneth Racicot, Emmanouil Apostolidis (2019) - Antibiotics (Basel, Switzerland)
7. Ginnalin A and hamamelitannin: the unique gallotannins with promising anti-carcinogenic potential.
   Rippin, Vikas Beniwal, Ajay Sharma, Bikram Jit Singh, Seema Ramniwas, Katrin Sak, Satish Kumar, Anil K Sharma (2023) - Exploration of targeted anti-tumor therapy
8. Hamamelitannin from witch hazel (Hamamelis virginiana) displays specific cytotoxic activity against colon cancer cells.
   Susana Sánchez-Tena, María L Fernández-Cachón, Anna Carreras, M Luisa Mateos-Martín, Noelia Costoya, Mary P Moyer, María J Nuñez, Josep L Torres, Marta Cascante (2012) - Journal of natural products
9. The effect of sucralfate-containing ointment on quality of life in people with symptoms associated with haemorrhoidal disease and its complications: the results of the EMOCARE survey.
   Corrado Giua, Luigi Minerba, Antonio Piras, Nicolina Floris, Flora Romano, Group Sifac (2021) - Acta bio-medica : Atenei Parmensis
10. An Assessment of the Safety, Efficacy, and Tolerability of a Novel Scalp Treatment Regimen Combining a Hydroxy Acid-Based Scrub and Copper Tripeptide Serum in the Management of Seborrheic Dermatitis in Adults.
    Maheshvari N Patel, Nayan Patel, Apeksha Merja, Saurav Patnaik (2024) - Cureus
11. whISOBAX
    Reuven Rasooly, Hwang-Yong Choi, Paula Do, Gianluca Morroni, Lucia Brescini, Oscar Cirioni, Andrea Giacometti, Emmanouil Apostolidis (2020) - Antibiotics (Basel, Switzerland)
12. In vitro efficacy of antifungal agents alone and in shampoo formulation against dandruff-associated Malassezia spp. and Staphylococcus spp.
    C Leong, B Schmid, A Buttafuoco, M Glatz, P P Bosshard (2019) - International journal of cosmetic science
13. High-Throughput Screening to Identify Plant Derived Human LDH-A Inhibitors.
    S Deiab, E Mazzio, S Messeha, N Mack, K F A Soliman (2013) - European journal of medicinal plants
14. Witch Hazel Significantly Improves the Efficacy of Commercially Available Teat Dips.
    Reuven Rasooly, Adel Molnar, Paula Do, Gianluca Morroni, Lucia Brescini, Oscar Cirioni, Andrea Giacometti, Emmanouil Apostolidis (2020) - Pathogens (Basel, Switzerland)
15. The Effect of Tannin-Rich Witch Hazel on Growth of Probiotic
    Reuven Rasooly, Alex C Howard, Naomi Balaban, Bradley Hernlem, Emmanouil Apostolidis (2022) - Antibiotics (Basel, Switzerland)
16. Role of galloylation and polymerization in cytoprotective effects of polyphenolic fractions against hydrogen peroxide insult.
    Montserrat Mitjans, Vanessa Ugartondo, Verónica Martínez, Sonia Touriño, Josep L Torres, M Pilar Vinardell (2011) - Journal of agricultural and food chemistry
17. Evaluation of a Witch Hazel Extract for the Potential Prebiotic and Protective Effect on Select
    Morgan Failla, Jungyun Lee, Reuven Rasooly, Emmanouil Apostolidis (2022) - Frontiers in nutrition
18. The combined effects of exogenous and endogenous variability on the spatial distribution of ant communities in a forested ecosystem (Hymenoptera: Formicidae).
    Senay Yitbarek, John H Vandermeer, David Allen (2011) - Environmental entomology
19. Traction and Hot Fomentations for Osteo-Arthritis.
20. Revealing the Therapeutic Potential: Investigating the Impact of a Novel Witch Hazel Formula on Anti-Inflammation and Antioxidation.
    Xue Liu, Tamer-Whittle Hage, Li-Chi Chen, Eddy Hsi Chun Wang, I-Chien Liao, Jodi Goldberg, Sabina Gosto, Paula Cziryak, Maryanne Senna, Ying Chen, Qian Zheng (2025) - Journal of cosmetic dermatology