White willow: properties, benefits and why it is known as the natural aspirin

Today's daily routine can subject us to chronic sedentary behaviour and levels of physical stress that our body quickly somatises in the form of inflammation.

Aspirin emerged from white willow to resolve all these discomforts. How did it all begin? Does white willow have the digestive drawbacks of aspirin? What is the effect of white willow? Below, we answer all these questions.

 

 

What white willow is and why it is considered the natural precursor to aspirin

 

Long before modern pharmacies existed, our ancestors already knew which tree to lean on. Over 2,000 years ago, historical figures like Hippocrates were already recommending chewing white willow bark to relieve pain and reduce fever. Knowledge of its properties spread across various civilisations; in ancient Egypt, the famous Ebers Papyrus (dating to around 1543 BC) explicitly mentioned it as an indispensable herbal remedy to relieve generalised body aches and soothe inflammation.

The definitive bridge between this age-old herbal tradition and modern analytical science was built in 1763 by the English reverend Edward Stone, who documented the efficacy of this tree's bark powder for treating fevers to the Royal Society of London. As early as the 19th century, analytical chemistry allowed the active principle responsible for these effects to be isolated: tiny crystals that were named "salicin".

In 1897, the pharmaceutical industry managed to modify this molecule in the laboratory through an acetylation process to create acetylsalicylic acid (the famous aspirin). However, the laboratory version, being an isolated and synthetic compound, often brings about notable stomach irritation.

This is where nature shines: upon consuming white willow bark, the salicin is accompanied by an "entourage" of other nutrients (such as flavonoids and tannins). This phytocomplex means that the release of the active principle is more sustained over time and, most importantly, could present better digestive tolerance.

Differences between white willow and aspirin: efficacy and digestive tolerance

Effects of aspirin on the stomach

When acetylsalicylic acid is synthesised in its purest form and ingested, this compound comes into direct contact with the stomach walls in a highly reactive and acidic state. Its mechanism of action is rapid, but it presents a significant physiological drawback: it immediately inhibits gastric enzymes responsible for producing the stomach's protective mucosa.

• Without this defensive barrier, the gastric acids themselves and the synthetic aspirin compound can irritate, inflame and damage the digestive tract.

Why white willow could have better digestive tolerance

Conversely, when ingesting the compound derived from the plant, salicin is firmly bound to a glucose molecule. This molecular bond acts as a protective shield allowing it to pass through the upper digestive tract without being fully activated.

• In this initial phase it is not in its active form, which could explain its lesser gastric impact.

It is in the hepatic tissue where, slowly, gradually and meticulously controlled by our own enzymes, it oxidises to finally become salicylic acid. This long journey would favour a more gradual release of the active principle into the bloodstream, which could contribute to a more sustained effect over time, intervening in the processes involved in pain perception from the root and, above all, which could contribute to lesser gastric irritation.

To better understand the fundamental difference in the metabolic behaviour of both compounds, we can observe it in the following comparison:

Characteristic	White willow extract (natural)	Acetylsalicylic acid (synthetic)
Active principle	Salicin (accompanied by the phytocomplex)	Acetylsalicylic acid (isolated molecule)
Site of activation	Intestine and liver (acts as a prodrug)	Stomach (direct and reactive contact)
Gastric tolerance	High (protects the digestive mucosa)	Low (risk of irritation and damage to the mucosa)
Speed of action	Slow, gradual and sustained release	Rapid, intense and shorter duration

Benefits of white willow

The botanical derivatives of white willow have shown promising results according to multiple studies for various everyday scenarios that diminish our productivity and quality of life.

Lumbar discomfort and non-specific back pain

Sedentary work, endless hours in front of screens on chairs with poor ergonomics and great biomechanical stress have turned lower back pain into a true silent global epidemic.

Clinical trials suggest that people suffering from recurrent episodes of lower back pain experience a statistically significant reduction in pain intensity following the administration of salicin, presenting exceptional long-term tolerability compared to other conventional treatments and reducing the need to resort to more aggressive therapies¹.

• White willow contributes to muscle and joint health²

Joint comfort and slowing of cartilaginous wear

As we age, or as a consequence of practising continuous high-impact sports (such as long-distance running, tennis or weightlifting), our joints suffer inevitable daily microtraumas. The cartilage becomes inflamed and wears down, giving rise to degenerative processes that present with morning stiffness and a severe lack of range of motion.

Due to its capacity to selectively modulate the cellular inflammatory response (inhibiting key enzymes such as COX-1 and COX-2), the white willow plant could help to reduce oedema and joint swelling, which would contribute to improving joint function in some cases.

Management of tension headaches and mental fatigue

That persistent pain that begins as a diffuse pressure at the nape of the neck and spreads insidiously like a tight elastic band around the forehead is usually clinically categorised as a tension headache. Frequently, this discomfort is mediated by profound involuntary muscle tension in the cervical area and the progressive accumulation of psychological stress throughout the working day.

The analgesic effect of salicin, thanks to its sustained release in the liver, could be useful as support in the management of this type of discomfort without overloading the body's detoxification pathways.

• White willow is a bodily strengthener and restorative³

Improved comfort during the menstrual cycle

The dreaded and acute intense menstrual cramps are intrinsically related to an aggressive local overproduction of molecules called prostaglandins in the uterine tissue. This chemical excess sends direct signals that provoke contractions, ischaemia and muscle spasms that are tremendously painful and, in many cases, incapacitating for a woman's daily routine.

Bearing in mind that the main axis of cellular action of salicylic acid is precisely the direct blocking of the synthesis of these prostaglandins, it could be a resource to make the most complicated days of the hormonal cycle much more bearable, with a potential anti-inflammatory effect and good digestive tolerance in certain profiles⁴.

Frequently asked questions about white willow (FAQs)

How long does it take for white willow to take effect?

Unlike synthetic compounds that act almost immediately upon reaching the stomach, white willow works as a natural prodrug. This means that it needs to be processed by the intestinal microbiota and the liver before converting into its active form.

For this reason, its initial effect may take a little longer to be noticed (usually between 1 and 2 hours), but in return, it offers a much more sustained and stable release curve, providing prolonged relief over the hours without generating sharp peaks or sudden drops.

Is it better to take an infusion or use a standardised white willow extract?

Bark infusions are a wonderful age-old practice, but they present a major technical challenge: variability. Depending on the age of the tree, the climate or the harvesting season, an infusion can have a lot or no amount of active principle at all.

By opting for a white willow in standardised dry extract format, laboratory analysis guarantees that we are ingesting the exact and optimal concentration of salicin (the active principle) and its phytocomplex, ensuring real and constant efficacy in each dose.

Is white willow safe if I tend to have heartburn or a delicate stomach?

This is, precisely, one of its greatest botanical advantages. Conventional analgesics usually irritate the stomach because they inhibit the production of the protective gastric mucosa. The plant's salicin, however, travels bound to a glucose molecule that inactivates it as it passes through the stomach, preventing any corrosive action.

The real transformation occurs further on, in the intestine and the liver, making it a generally well-tolerated option for people with mild digestive sensitivity. (Note: If you suffer from diagnosed gastric ulcers, you should always consult a healthcare professional before introducing any active ingredient).

Can white willow be taken daily?

Thanks to its good digestive tolerance in most of the described cases, it can be used both acutely (for example, to mitigate a tension headache or menstrual discomfort) and in medium-term regimens for the management of joint comfort and morning stiffness during periods of greater physical wear and tear.

However, as a general rule in phytotherapy, it is advisable to establish rest periods after several weeks of continuous use to maintain the body's receptivity, or else follow the guidelines of a specialist according to individual needs.

Side effects and contraindications of white willow

Its consumption is strictly contraindicated in those people with a history of known allergies to salicylates, as well as in patients suffering from asthma induced by them. Due to its mild but verifiable effect on microcirculation and blood fluidity, it must not be combined with anticoagulant or antiplatelet pharmacological treatments without the express supervision and authorisation of a medical practitioner.

As a universal precautionary measure, the labelling instructions should always be followed, advising against its use during pregnancy and throughout breastfeeding⁵.

Bibliography

1. Chrubasik, S., Eisenberg, E., Balan, E., Weinberger, T., Luzzati, R., & Conradt, C. (2000). Treatment of low back pain exacerbations with willow bark extract: a randomized double-blind study. The American Journal of Medicine, 109(1), 9-14.
2. Extracted from the European Commission compilation list, under EFSA evaluation (ID 3884).
3. Extracted from the European Commission compilation list, under EFSA evaluation (ID 2488).
4. Vlachojannis, J. E., Cameron, M., & Chrubasik, S. (2009). A systematic review on the effectiveness of willow bark for musculoskeletal pain. Phytotherapy Research, 23(7), 897-900.
5. Shara, M., & Stohs, S. J. (2015). Efficacy and Safety of White Willow Bark (Salix alba) Extracts. Phytotherapy Research, 29(8), 1112-1116.

This article is strictly for informational purposes and does not replace the advice of a healthcare professional.