Botanical Name – Reynoutria japonica
Chinese Name – HU ZHANG
English Name – Japanese Knotweed
Tincture made by a process of hydro-ethanolic percolation, with a ratio of 1 part Japanese Knotweed Herb to 3 parts liquid. Liquid comprises of 75% water and 25% sugar beet derived ethanol.
Reynoutria japonica, commonly known as Asian knotweed or Japanese knotweed, is a large, herbaceous perennial plant of the knotweed and buckwheat family Polygonaceae.
It is native to East Asia in Japan, China and Korea. In North America and Europe, the species has successfully established itself in numerous habitats and is classified as an invasive species in several countries.
Japanese knotweed has hollow stems with distinct raised nodes that give it the appearance of bamboo, though it is not related.
It is listed by the World Conservation Union as one of the world’s worst invasive species. The invasive root system and strong growth can damage concrete foundations, buildings, flood defences, roads, paving, retaining walls and architectural sites. It can also reduce the capacity of channels in flood defences to carry water
Medicinal Action and Uses
Anti-aging – The herb contains lots of resveratrol which has been thought to be one of the best anti-aging compounds around.
Cognitive – one of the most well known and widely relied on benefits of Japanese knotweed is its apparent effect on cognitive disorders, like Alzheimer’s disease and dementia. This is primarily due to the resveratrol content of the herb.
Cardiovascular – the resveratrol in Japanese knotweed has been known to counter the development of heart disease and cardiovascular complications, such as high cholesterol with a high- fat diet.
Gastrointestinal – Japanese Knotweed can assist with gastrointestinal issues such as constipation, bloating, cramps, inflammation, or chronic pain. It also has mild laxative effects.
Product is supplied in amber PET bottles with tamper evident screw tops.
Product is supplied in amber PET bottles with tamper evident screw tops. This keeps the contents fresh and protected from light. Look out for the QR code on the label - you can scan this with your smartphone to download the Certificate of Analysis document for this product.
What is a Tincture?
A herbal tincture is a concentrated extract of one or more herbs. The liquid in a tincture is a combination of alcohol and water. A tincture must contain at least 20% alcohol for preservation purposes. Alcohol concentrations tend to vary between 20% and 60%, but can be as high as 90% in some circumstances. At Herbal Apothecary we generally produce tinctures with alcohol concentrations of 25% - 45%. We use ethanol derived from sugar beat.
How Is A Tincture Made?
To produce the Reynoutria japonica / HU ZHANG / Japanese Knotweed Tincture we combine a quantity of herb with a proportional amount of liquid. Depending on the herb and the strength of tincture required this ratio can be 1:2, 1:3 or 1:4. The herb, alcohol and water is placed in a production vessel suitable for the size of the batch.
Traditionally, tinctures have been made by a process of maceration. This is where the herb sits in the liquid and over a period of time the plant cells break down. This allows the plant matter to be released into the liquid. Occasionally the producer might agitate the mixture to help the process along.
At Herbal Apothecary we have spent decades improving our tincture production processes. We use a system called Hydro-Ethanolic Percolation. Percolation is where liquid slowly passes through the herb, from top to bottom. In our case, the liquid is not simply passed through the herb once and then collected. Instead, it is continually cycled through the herb. Hydro-Ethanolic Percolation is a combination of maceration and traditional percolation. The circulation of liquid through a spray head agitates the herb, helping the key chemical compounds to be released into the liquid.
Our production vessels are primarily stainless steel. We use low voltage (24v) pumps to circulate the liquid. We have also developed a system of float switches and relays. These ensure the pumps only activate when an adequate level of liquid is present in the sump at the bottom of the vessel. It can take some time for the liquid to filter through the herb.
We produce most of our tinctures using dried herbs, although we sometimes use fresh. It's important that the size of the pieces of herb in the production vessel are small enough for the alcohol to thoroughly penetrate. No prior processing is required for flowers and leaves which are smaller and more delicate. However, for roots, bark and berries which tend to be tougher and larger we use herbs which are diced up into small pieces. This ensures that the maximum amount of plant material can be extracted into the liquid.
The manufacturing process takes 7 days to complete. Once the process is finished, the herb is pressed to extract every last drop of precious liquid. The Reynoutria japonica / HU ZHANG / Japanese Knotweed Tincture is filtered and then stored in bulk containers, before being bottled in smaller 250ml, 500ml and 1000ml quantities.
Click here if you'd like to know more about our herbal tincture manufacturing technology. At Herbal Apothecary we are committed to research - we want to provide a robust evidence base for the products we produce. As a result we review our manufacturing systems and processes in order to ensure we're making best use of the raw ingredients.