Black Haw Interactions Overview
Check For Interactions With Black Haw
Black Haw
- Viburnum prunifolium
- Blackhaw
- Nanny Bush
- Southern Black Haw
- Stag Bush
- Viburno
- Viburno Americano

Additional Details
Is Black Haw Safe? Are There Any Warnings?
Black haw, also known by various names like Nanny Bush and Stag Bush, is a shrub that thrives in the woodlands of southern North America. Its distinctive features include oval serrated leaves, pale flowers, and deep blue-black berries. When it comes to safety, the stem bark of black haw, found in many foods, is generally considered safe for consumption. This is supported by its recognition as Generally Recognized As Safe (GRAS) for use in foods in the US.
However, it's important to exercise caution with the root bark of black haw, especially during pregnancy. Some evidence suggests that black haw might have uterine relaxant effects, which could potentially interfere with pregnancy. Therefore, pregnant individuals are advised to avoid using black haw to ensure the safety of both themselves and their unborn child. Research regarding its effects during lactation is limited, and more information is needed to make informed decisions in that regard.
How Is Black Haw Thought To Work? What Is the Mechanism of Action?
The beneficial effects of black haw are attributed to its active constituents found in both its root bark and stem bark. These constituents include scopoletin, tannins, oxalic acid, salicin, salicylic acid, iridoid glycosides, coumarins, urolic acid, and oleanolic acid. One of the most intriguing actions of black haw is its impact on smooth muscles, particularly those of the uterus.
Throughout history, black haw has been traditionally used to relax the uterus and other smooth muscles in the body. This smooth muscle-relaxing effect is particularly valuable for conditions related to the female reproductive system. The presence of scopoletin, a component found in black haw, is believed to contribute to its remarkable uterine relaxant properties.
Pharmacokinetics
Despite the rich history of traditional use and ongoing interest in black haw, there is still an insufficient amount of reliable information available about its pharmacokinetics. This includes how the body absorbs, distributes, metabolizes, and eliminates the active components present in black haw. Further research is required to shed light on this aspect and provide a comprehensive understanding of its pharmacokinetic profile.
Interaction Overview
Black haw doesn't appear to have well-documented interactions with drugs, supplements, or medical conditions. However, it's worth noting that black haw contains oxalic acid (oxalate), which has the potential to bind to multivalent metal ions like calcium, iron, and zinc within the digestive tract. This interaction could lead to decreased absorption of these essential minerals from foods and supplements. As a result, individuals who are considering black haw supplements should be aware of this theoretical interaction, especially if they are concurrently taking calcium, iron, or zinc supplements.
Common Side Effects To Watch For
Fortunately, there have been no reported adverse effects associated with the use of black haw. However, it's important to approach its usage with an element of caution, as a comprehensive assessment of its safety outcomes has not been fully conducted. Given this limited data, individuals using black haw are encouraged to monitor their well-being and report any unusual or unexpected reactions to healthcare professionals.
Are Supplements Standardized?
At present, there is a scarcity of reliable information concerning the standardization of black haw supplements. Standardization is a crucial aspect of herbal supplements, as it ensures consistent levels of active compounds from batch to batch. This consistency directly impacts the effectiveness and reliability of the supplement. Therefore, individuals seeking the benefits of black haw should consider products that emphasize standardized formulations for greater assurance of quality and potency.
What Is Black Haw Typically Used For?
Black haw boasts a rich history of traditional use as a tonic, diuretic, and antispasmodic. Its potential applications are varied and have intrigued researchers and herbal enthusiasts alike. Despite its historical and folkloric reputation, concrete evidence for its effectiveness in specific areas is still lacking.
Various uses, such as addressing asthma, diarrhea, dysmenorrhea (painful menstruation), and miscarriage, have garnered attention. However, as of now, there is an insufficient amount of reliable evidence to definitively rate its effectiveness for these particular purposes. Further research is required to comprehensively explore and confirm the potential therapeutic uses of black haw.
Drugs that interact with Black Haw
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Parts of this content are provided by the Therapeutic Research Center, LLC.
DISCLAIMER: Currently this does not check for drug-drug interactions. This is not an all-inclusive comprehensive list of potential interactions and is for informational purposes only. Not all interactions are known or well-reported in the scientific literature, and new interactions are continually being reported. Input is needed from a qualified healthcare provider including a pharmacist before starting any therapy. Application of clinical judgment is necessary.
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