Bio Active Herbal see also: Kombucha Tonics 
About Lewtress
"Thank you very much indeed for the speedy, efficient and professional manner in which you handled my first order from you. I was very impressed by the manner in which you kept me posted, even to the point of letting me know of the impending dispatch of the order, which arrived this morning in remarkably quick time. In a competitive market, and one which is also infiltrated by fraudsters, the importance of efficiency, professionalism and trust is even more of a prerequisite." K Poole
"Thank you. What great support and attention from you. How wonderful to have a company that cares. Thank you for looking after me." J Montgomery

rob and cathay Rob and Cathay
In a rain forest rich in herbs and fungi
Cathay Wootres and Rob Lewis

Certified Iridologists and Naturopaths.
C.I.B.T.A.C. C.I.D.E.S.C.O. A.E.T. B.A.B.T.A.C
British Association of Complementary Therapies
Rob and Cathay founded Lewtress Natural Health in 1994 after a friend recommended that they should find a Kombucha Culture to make a tonic for Cathay’s father who was diagnosed with a carcinoma. Before allowing her father to drink Kombucha, she asked her fathers cancer specialist, who happened to be Polish, if it would be of any benefit to him. Yes was the immediate answer. He not only knew about the tonic but expounded its benefits and history and its uses to this day as a daily health tonic used in Poland.
Cathay Wootres was born in the U.S.A. and her American father bought her up on Indian folklore Medicine and where possible in her childhood, avoided antibiotics and expounded the use of healthy food and lifestyle. Her Maternal Grandmother who lived with them was Greek and taught the family the healthy Mediterranean way with plenty of olive oil, fresh vegetables and red wine. Cathay’s family moved to Australia where she went to school and grew up with the Aboriginal folklore and bushman knowledge of survival with the use of plant medicine in the outback and of course the dreamtime and walkabout stories. After Australia they moved to Papua New Guinea where again traditional folklore and knowledge of the fruit and herbs were used for medicines. rainforest plants - ancient remedies

In 1980 they ended up moving to the U.K. where Cathay trained at Champneys – the United Kingdom’s first health farm – founded by Naturopath Stanley Lief in 1925 bringing the pioneering concept of treating the whole person; mind, body and soul in to public awareness.

Specialising in Aromatherapy and therapeutic massage rehabilitation, Cathay then moved to Jordan. Here she had the extraordinary experience and privilege to work with members of the Royal Family who encouraged her to learn more complimentary therapies thereby adding to her already vast knowledge and experience.

The Bedouin Arabs of Jordan use many herbs and spices for health in everyday foods such as kakadai, sumach, yoghurt, hummus and spinach, which are all considered to be nutritious digestives.

In 1989 Cathay returned to the U.K on holiday and had the unfortunate experience of contracting salmonella poisoning, which in turn resulted in M.E. Her first hand experience of trying to regain her health and the inability of the Medical Profession to help, gave her a personal insight into the lack of knowledge into this condition, which in the 21st century is now re-named Chronic Fatigue.

Having tried a multitude of complimentary therapies to try to help, including medical herbalism, reflexology and others, she found that the condition seemed to have a rebellious nature and just when a treatment seemed to be working her body would react violently to it. In the end she stopped all treatments to enable her to function at least to the level of opening a clinic and seeing a couple of clients a day, considering that to be her own physiotherapy for mind and body.

Cathay has always believed in trying out everything she recommends, so she built herself up to drinking at least half a litre of Kombucha a day. She found the de-toxing gentle but effective and slowly started to regain stamina. Although her memory wasn’t still up to the ability it was before Chronic Fatigue, (a common symptom) she found that with continued use of Kombucha memory function soon improved and things went ahead from there.

The Clinic then started to sell Kombucha for various health conditions with feedback always first hand and accurate. With the Clinic’s hands on treatment, it has always been very evident just how effective Kombucha tonics can be.

With Chronic Fatigue comes a multitude of food intolerances, chemical intolerances and deficiency (vitamin/mineral) symptoms. To help understand this Cathay qualified as an allergy and food intolerance tester in 1998.

The knowledge gained from using various Kombucha products for de-sensitisation led on to the development of a complete range of herbal supplements, all based on live Bio-active Kombucha culture extract. Apart from being unique, these Kombucha based herbal supplements are far more absorbable and readily utilised by the body than herbs in other forms, e.g. tablets and capsules which have to be digested. The digestion process destroys up 60% of the herbal benefit. This is why we have stuck to the production of herbs in liquid form. The only downside to liquid herbs is the taste, most people say that the benefits far outweigh any taste issues. Generally herbs are very strong but maximum benefits are only gained from being able to taste the herb. See our 'Bio Active Herbal Supplements' on the menu.

Rob Lewis, the alchemist of the two, grew up in the countryside of West Wales on a virtually self sufficient organic farm which his parents ran as close to nature as possible. He learned from a young age that nature knew best. He first trained as a herbalist using natures plants to maintain health, gaining a background in Homeopathy he moved in to the science of Iridology (body system analysis through the iris) practising at an intermediate level. He also had the useful experience of a paediatrician from a local hospital interested in his work, who referred two children with chronic constipation and digestive problems to him. Using Kombucha therapy and plant medicine and under the watchful eye of the consultant, these childrens health conditions improved, re-emphasizing the power of natural medicine. Using Kombucha based preparations as the foremost basis of health treatment, they have proven themselves to be capable of helping regain health countless times ever since.

Rob’s advanced and unique fermentation process has produced a Kombucha tonic that naturally contains the major detoxifying element glucuronic acid sought after, in vain, by all commercial Kombucha manufacturers. This detoxifying element has been the subject of a study by the Kombucha research group in America which conducted a study to find this important element. It found that out of the nineteen manufacturers, bottled and capsulated tested, none of them were proven to contain glucuronic acid. Rob’s Kombucha tonic has undergone two independent tests, one by a British laboratory and the other by the Kombucha research Lab in Utah, both confirmed glucuronic acid present in Lewtress products.

This is why Lewtress Kombucha tonics are so effective. To help back this up Trading Standards have repeatedly tested our products with their ‘on the shelf test’ proving that Lewtress Kombucha tonics are natural, live palatable drinks and remain this way, without the use of any additives, colourings, stabilisers, preservatives or heat treatment/pasteurisation processes of any kind, unlike most other commercially produced Kombucha products on the market throughout the World today, Rob is still the only producer in the UK and beyond to have achieved this. In addition, research showed that the Lewtress recommended serving of Kombucha tonic was half that normally suggested by others.

The second phase of Lewtress began in 1998 when after extensive research Rob found that some herbs and their beneficial effects were enhanced by the Kombucha fermentation process. Lewtress have an extensive range of bio active herbal supplements, with new formulations being added to the list every year. Click on  product menu to view our range of bio active herbal supplements. Rob and Cathay are Certified advanced Iridologists and Naturopathic practitioners, able to offer a broad spectrum of knowledge and expertise in natural health, and as a team continue to research and keep up with ever changing 21st Century health problems. 

Cathay has also suggested a course of Kombucha tonic to clients planning pregnancy, this has resulted in great success on many occasions. Cathay’s staff at the clinic alone, have produced between the three of them six healthy babies. 

Rob and Cathay began selling the products through Cathay’s Natural Health Clinic and had wonderful feedback. Reports of the benefits of their Kombucha products soon spread, and they have now expanded production to a purpose built unit in West Wales. Here, the Kombucha cultures benefit from fresh air and sea breezes, elements Rob and Cathay believe to be essential to the growth of their cultures.

Their Kombucha products help sustain a healthy lifestyle and can quickly and effectively help any problems that arise, from simply maintaining your health to chronic conditions.

Always remember that natural supplements support the body and maintain health, treating the cause, not the symptoms. Drugs, on the other hand, are designed to treat the symptoms and not the cause.

Rob Lewis and Cathay Wootres established Lewtress in 1994 as a family run business and in 2003, due to steady growth and success, enlisted a full time production manager, web master and part time book- keeper. Lewtress still prides itself in offering a personal and friendly service second to none.

"My order arrived today in record time and the first tablets already swallowed - thankyou so much for such excellent service!" Auriol B
"Customer service is excellent. Even in the busy pre-Christmas period Lewtress was able to deliver a large package as requested within 24 hours of the order being placed." Adrian R
"I have been working with Rob now for the past year and I cannot recommend him highly enough for his dedication to providing the best quality, natural products and giving a full support system of back-up for any advice needed. I was introduced to Cathay firstly, Rob’s wife, through a family friend and at the time I was suffering acute panic attacks and anxiety. Cathay instructed me what to buy from the health shop and also introduced me to their Kombucha drink (Echinacea Elixir was the particular one Cathay thought would be good for me at that time). After a very short period I was able to keep the panic attacks at bay and was feeling pretty good. Last Autumn I began working with Rob to combat the onslaught of colds and coughs, he recommended Elderberry Echinacea Complex and Echinacea Purpurea Root capsules which I used whenever I felt a cold or any illness creeping up on me. I can honestly say that if you take the recommended dose as soon as you even suspect you might be under attack from a virus it will bat the virus back into oblivion. More recently I have been working with Rob on immune boosting as the panic attacks left my insides not fully functioning, ie. I had lost a lot of weight and I did not feel I was absorbing nutrients correctly as I would regularly pick up bugs and feel run-down. Rob then introduced me to Dygecol, Wheatgrass and Chlorella. I have been taking these for a few months now and have finally been able to put on weight at a steady pace and have started to feel more robust as the nutrients are absorbed more fully in the gut and I have been able to fight off more attacks of viruses, as Rob informed me that a healthy and efficient digestive system is responsible for 70% of our immune system. I am so very grateful to be in the position I am now compared to how I was before I started working with both Cathay and Rob. They certainly know their stuff and I have not been backwards in coming forwards in letting everyone I come across know of their products. But unlike the people I’ve tried to introduce the products to, I suspect that if you are reading this, you have taken the initiative to research health support for yourself, so take it from me, you’ve come to the right place. Thank you Rob and Cathay for your devotion and commitment to natural health and helping people along their way. Fond wishes from the bottom of my heart." Sarah

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Lewtress Natural Health Ltd is Registered in the United Kingdom No. 05173690

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Postage and Packaging

The cost of postage is automatically calculated and clearly displayed when you add an item to your basket. All products on this website are in stock ready for immediate dispatch from the United Kingdom.

United Kingdom:
  • Same working day dispatch for orders received before 3pm Monday to Friday.
  • Capsules and concentrates are sent by Royal Mail first class post, so special delivery instructions are not applicable. If ordered before 3pm on a workday, first class mail will usually arrive next working day, but this cannot be guaranteed. All orders over £75 are upgraded to recorded delivery (at no extra cost). Postage cost of letterbox friendly capsules is £1.95, larger bottles £3.60.
  • Free shipping for all orders over £55.
  • Orders containing 1 litre drinks: £7.95 any number of bottles. Kombucha orders are sent by courier, a signature will be required unless reasonable alternative delivery instructions can be carried out (eg If not in, leave with next door).
  • Orders not delivered within 14 days must be reported straightaway.
United Kingdom Next Working Day Delivery:
  • You will be able to choose this option if you are placing an order between Monday-Friday before 3pm. A signature will be required on delivery.
  • Capsules and small concentrate bottles (50 and 100ml bottles) are shipped for £8.10 to any United Kingdom postcode.
  • Orders containing 1 litre drinks: £7.95 any number of bottles. Orders are sent by courier on a next working day service if we receive the order early enough, normally we can send most orders the same day. A signature will be required unless reasonable alternative delivery instructions can be carried out (eg If not in, leave with next door).
United Kingdom (Outlying area): (please allow 3 - 5 working days)
  • Our couriers treat any areas which are not on mainland England, Wales or Scotland as 'outlying'. This includes all islands, North and South Ireland and certain remote areas of the Scottish Highlands. If you live in one of these areas, please choose this shipping option. These postcodes are outlying areas:
    AB31–AB38, AB41–AB45, AB51–AB56, BT - ALL, FK19–FK21, GY1–GY9, HS1–HS9, IM – ALL, IV1–IV28, IV30–IV32, IV36, IV40–IV49, IV51–IV56, IV63, KA27–KA28, KW1–KW14, PA20–PA38, PA41–PA49, PA60–PA78, PH1, PH5–PH10, PH15–26, PH30–PH44, PH49–PH50, TR21–TR25, SHETLAND, ISLE OF WIGHT, ORKNEY, HEBRIDES.
  • Capsules and small concentrate bottles (50 and 100ml bottles): £3.60 any amount of bottles
Europe: on average 5 - 7 working days but please allow up to 21 working days as delivery times can vary from country to country
  • Capsules and concentrates (50 and 100ml bottles): £3.95 any amount
  • 1 litre drinks: Please contact us for charges as they vary from country to country
USA / Rest of World: Please allow 7 - 10 working days, this is only a guide as extra security measures can cause delays. Delivery times can vary depending on the postal system in your country. Refunds or replacements will only be issued if an item is not delivered within 28 days.
  • Capsules and concentrates (50 and 100ml bottles): The total will be calculated and displayed according to the contents of your basket
  • 1 litre drinks: Please contact us for charges as they vary from country to country


Large parcels may need to be signed for. In the event that no one is available to sign, goods will be returned to our carrier’s depot and you will be contacted to arrange a convenient time to re-deliver, at no extra cost. If your order does not turn up within the expected timescale, please contact Customer Services on 01239 654111 and we will be happy to help.
Customers in Estonia: Please note that we have had some products returned by Estonia customs. If you wish to have products delivered to this country, please check with customs before ordering. If an item is returned to us from customs then we will issue a refund less postage and admin charges.

Cheque Orders

You will notice that we offer the option to pay by cheque. If you choose this option you must send your cheque first before you receive your goods. We will dispatch your order on receipt of the cheque.


Whilst we have made every effort to ensure that our product descriptions are accurate, descriptions are to be used as a guide only. We do not accept responsibility for accidents or injury which may occur due to errors or omissions on this web site. Always refer to the instructions on the product itself.

Money back Guarantee Refunds

Rose Hip extract:
Our money back guarantee for 7500mg Rose Hip is only applicable in cases of Osteo arthritis, we will not issue a refund if the product has been taken for Rheumatoid arthritis. We do insist that the used containers are returned to us with your order number and a covering note within 21 days from the date of purchase. Our money back guarantee does not apply to 2500mg Rose Hip or any of the trial packs

If you are not delighted with your purchase you have the right to cancel within seven days of your purchase, or seven days from the receipt of the goods (whichever is longer). If you cancel your order you will have your payment returned, provided you return your goods to us unopened, and in good condition, to the address shown on the contact us page. In all cases please call us first on 01239 654111 to tell us and to be issued with a returns number. Please note that we do not refund any postage or freight charges on goods dispatched as ordered.
Complaints Procedure

We hope that you will never have cause to complain about our products or services. If however, you do have a complaint, please call us on 01239 654111 between the hours of 9am and 5pm Monday to Friday and we will do our best to assist you. If you wish to return a product, please call us first on 01239 654111 to tell us about your problem and to be issued with a returns number. Delays in shipping within the UK can sometimes occur and are beyond our control. Where an item has not been delivered after 10 working days we will then consider re-dispatching the order. For orders placed outside the UK: If an order is undelivered within 28 days we will offer to dispatch a replacement or offer a refund.

According to United Kingdom law, you must be aged 18 or over to purchase online.

Lewtress Natural Health Ltd is Registered in the United Kingdom No. 05173690

Lewtress Natural Health Ltd is VAT Registered in the United Kingdom No. 827199789