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Zentonil Liver Tablets for Dogs & Cats

Zentonil Liver Tablets for Dogs & Cats
Advanced 100mg » Pack of 30

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  • Advanced 100mg » Pack of 30 £45.49
  • Advanced 200mg » Pack of 30 £85.99
  • Advanced 400mg » Pack of 30 £109.99

Selection of 3 products from

£45.49 to £109.99


Zentonil is a nutritional supplement that serves as an aid in all situations where the liver is known or suspected to be under stress. Zentonil tablets are formulated for dogs and cats to help support liver function. The tablets can be split into halves or quarters and are best given with no food in the stomach (either 2 hours before or 2 hours after a meal)

Zentonil Advanced 100mg are for cats. For the correct option for your dog please see below and match up to what your dog weighs.

Zentonil contains SAMe as well as Silybin (from Milk Thistle). The Zentonil rate is 100mg of tablet per 5kg bodyweight

Zentonil Advanced tablets contain the pure, stable salt of S-adenosylmethionine (SAMe), developed specifically for veterinary use in dogs and cats. Thanks to patented and highly exclusive microencapsulation technology, tablets may be split, crushed or chewed without compromising SAMe bioavailability. They also have the added benefits of silybin.

SAMe particles are individually microencapsulated before the addition of silybin, to preserve bioavailability. The silybin in Zentonil Advanced is complexed with phosphatidylcholine, which has been shown to significantly increase bioavailability.

Feeding guidelines

The following table shows the daily feeding amount of tablets based on animal weight. The tablets can be split into halves or quarters and are best given either 2 hours before or after a meal.

Animal Weight Advanced 100 Advanced 200 Advanced 400
2.5kg ½
5kg 1 ½
10kg 2 1 ½
20kg 2 1
40kg 2

Need help or advice? Contact us:

  • Landline: 01582 842096
  • Mon - Fri: 8:30am - 5:00pm
  • Sat: 9:00am - 1:00pm (Collections only)
  • Email: [email protected]

All prices include VAT where applicable.

Delivery Information

How quickly do you deliver?

Under almost all products on our website is an Estimated dispatch time, check this for a delivery prediction specific to the item you are looking to purchase. These badges are updated live based on the stock levels we have and also those of our suppliers - so are usually very accurate, but cannot be guaranteed. In more general terms, we aim to dispatch all orders within 1 working day of receiving payment (and a prescription if required). If we cannot do so within 3 working days we will contact you by email.

What do you charge for delivery?

For UK delivery, we charge the following:

Order Total Weight Delivery
£0-£28.99 Under 2kg £2.99
2kg+ £4.99
£29-£38.99 Under 2kg Free
2kg+ £4.99
£39+ Under 2kg Free
2kg+ Free

Prices quoted are for delivery to all parts of mainland UK except certain Scottish postcodes (where the price is higher for items sent by courier. Delivery of food abroad (including Channel Islands, N. Ireland and other islands around the UK) is charged at a higher price and free delivery is not available. Temperature controlled products are also not always subject to the standard and/or free delivery options.

For full information on our delivery charges, including prices on heavy deliveries to Scotland and abroad, see our delivery information page.

We can deliver most items to all around the world, but prices do vary. To find the exact cost of shipping your item, and to see all options available, follow these steps:

  1. Put the items you wish to order in your basket
  2. Proceed to checkout and enter your delivery address, including country
  3. Delivery information including price will automatically update to what is available to you

Delivery of aerosols

Due to restrictions aerosols can't be sent by Royal Mail. We appreciate your understanding.

Delivery of temperature controlled items

Some products, such as non-ambient items and frozen food, need to be delivered in insulated packaging to prevent them from getting too warm (or too cold) during transit from us to you. Purchasing any of these items in your order will result in a £1.99 charge being added to the total to cover the high cost of the insulated packaging materials. You only pay the £1.99 once per order, regardless of how many temperature controlled items you purchase in that order.

How do I cancel or return an order?

Please call us as soon as possible if you need to amend or cancel an order on 01582 842096. If your order has been processed for dispatch we will be unable to cancel or amend the order. You will however be able to return your product for a full refund*.

To return an item, you must contact us by phone or email to arrange this BEFORE posting any product back to us. We will explain the process at this stage for you.

*For full details on returns, see our terms and conditions page.

Reviews (3)

Q & A

Below are some recent questions we've received regarding Zentonil Liver Tablets for Dogs & Cats, including answers from our team.

28 April 2018 at 2:24pm

Milk thistle

Allyson Corrie

hi there my dog is already on this supplement recommended by my vet for increased alt levels would it be safe to also give milk thistle

  • Veterinary Advisor

Zentonil already contains milk thistle derivatives. You will not overdose by giving an additional milk thistle supplement but your dog may not gain any extra benefit. However it is safe to give both if you would like to try it.

15 July 2015 at 5:51pm

Zentonil versus Hepatosyl plus


My dog suffers with seizures as a result of excess bile on the liver... She is currently on Hepatosyl plus 200mg .. One a day but still has seizures every 3 months or so .. She is also on destolit that I get from you.. Do you think Zentonil would be any better for her.. My vet has said there is no more medication he can think of apart from what she's on ... She's nearly 13 and apart from the seizures is s happy little dog!! Thank you

  • Non-Executive Director

I think that there is very unlikely to be any difference between the results you would get from these two products. It is up to you which you use, either should help. The only other thing which might make a bit of difference would be a liver support diet, such as Hills L/D. It might make some difference. Otherwise it would be up to your own vet to investigate for other possibilities really as he/she is familiar with your particular dog.