FAQ

Ocu-GLO, stocked exclusively through Boss Pets in the UK, is a strong choice — an antioxidant formula built around grape seed extract, lutein and omega-3 fatty acids, formulated by veterinary ophthalmologists and widely described as the vision supplement most recommended by vet eye specialists.

Ocu-GLO is designed to protect the eye against free radical damage and support long-term ocular health. It was developed by two board-certified veterinary ophthalmologists and a compounding pharmacist with over 75 years of combined veterinary experience, and it's the number one vision supplement chosen by veterinary ophthalmologists worldwide.

Gelcaps deliver the most concentrated dose per serving and suit larger dogs best. Powder Blend capsules can be opened and sprinkled onto food, which works well for smaller pets or fussier eaters. Chewables are the most palatable option and are popular for small-to-medium dogs and cats. Choice generally comes down to your pet's size and how easily they'll take a capsule versus food.

Yes. Ocu-GLO is formulated for both cats and dogs, though it shouldn't be given to cats with a history of liver disease — always check the label for species-specific dosing.

It's intended for dogs 6 months and older and cats over 1 year old, weighing at least 5 lbs, with no history of liver disease in cats. It's manufactured to pharmaceutical-grade standards and has been tested for safety and palatability by its formulating veterinary ophthalmologists.

Many owners and vets report it helps maintain or slow the decline of eye health over time. Importantly, the manufacturer notes that stable vision — no further deterioration — is itself considered a positive result, not just visible improvement, since results vary by pet and condition.

his varies from pet to pet and depends on the underlying eye condition. Some owners notice a difference within a couple of weeks of daily use, while others take longer. Consistency with the daily dose matters more than speed of results.

Ocu-GLO doesn't treat or reverse existing cataracts, which are a structural change to the lens usually requiring veterinary or surgical treatment. It's an antioxidant supplement intended to support overall eye health and protect surrounding tissue, and is often used alongside — not instead of — a vet's cataract management plan.

It's commonly used to support ageing eyes and may help slow the progression of some degenerative conditions, though it isn't a cure. For a diagnosed condition, it's best used as part of a plan agreed with your vet.

The three cornerstone ingredients are grape seed extract, lutein (with zeaxanthin) and omega-3 fatty acids (EPA and DHA, sourced from fish such as anchovy, sardine and cod). Altogether the formula combines around a dozen antioxidants, vitamins and minerals in a single daily dose.

It's the skin of grapes and raisins — not the seed — that's linked to kidney damage in dogs. Grape seed extract is a different part of the plant entirely, rich in proanthocyanidins (antioxidants that support eye and whole-body health), and has no documented toxicity or side effects in dogs.

It's very well tolerated as an all-natural supplement. Occasionally a dose that's too high for a pet's size can cause mild loose stools — if this happens, pause use, then restart at half the dose and build back up gradually. In rare cases a pet may have an individual sensitivity to an ingredient; if you notice a change in behaviour, lethargy or vomiting, stop use and contact your vet.

A yellow or orange tinge is normal and comes from the concentrated lutein (derived from marigold) in the formula. Dark or tarry stool is different and can indicate digested blood, which isn't related to Ocu-GLO — if you see this, stop the supplement for a few days and contact your vet to check.

Ocu-GLO already contains the equivalent of a multivitamin, so a separate one usually isn't needed, though giving both is unlikely to cause an overdose. If your pet already takes a separate omega-3 supplement, it's best to pause that when starting Ocu-GLO, then reintroduce it gradually after about a week — loose stools are a sign the combined omega-3 dose is too high.

Dosage is based on your pet's weight — check the label for the right amount. Gelcaps and powder capsules can be hidden in a treat or a small amount of food (peanut butter or meat work well, allergies permitting), and giving it with a meal or snack helps absorption.

This depends on your pet's weight and which size you've bought, since larger pets need a higher daily dose. Check the product's daily usage guide to work out how long a given bottle will cover.

Three years unopened. The gelcaps are manufactured using a nitrogen gas-exchange process that removes oxygen from inside the capsule, which protects the antioxidants from breaking down over time.

Many vet ophthalmologists advise continuing Ocu-GLO up to the evening before surgery, then withholding it (along with food) on the morning of surgery as standard pre-anaesthetic practice, restarting with dinner that evening once your pet is eating normally again. Always confirm the exact timing with your own vet.

Nutramax's Cosequin and Dasuquin ranges, stocked exclusively at Boss Pets in the UK, are among the most established options, both built around glucosamine and chondroitin to support cartilage and joint comfort. Dasuquin goes a step further with added ingredients for more advanced joint support, making it a common choice for more severe or long-standing arthritis.

Cosequin's core formula is glucosamine hydrochloride and chondroitin sulfate. Dasuquin includes the same base ingredients plus ASU (avocado-soybean unsaponifiables), which helps reduce inflammation and support cartilage healing, and some formulas also add MSM. Dasuquin is generally priced higher than Cosequin to reflect this added ingredient.

It depends on the severity of the joint issue. Cosequin tends to suit milder cases and is a good lower-cost option, while Dasuquin is often recommended for more advanced conditions such as hip dysplasia, or during recovery from joint injury or surgery, thanks to the added ASU. Your vet can advise which fits your dog's specific situation.

Most dogs need 4–6 weeks of consistent daily use before a noticeable difference in comfort and mobility, though some owners see early signs within 2–3 weeks. After this initial loading period, the dose is often reduced to a lower daily maintenance level.

Yes — Cosequin is designed as a long-term maintenance supplement rather than a short course, and studies have followed dogs taking it daily for 12 months or more without serious adverse effects at standard doses. It's not known to burden the liver or kidneys in healthy dogs at recommended doses.

Side effects are uncommon and usually mild when they do occur, most often some digestive upset such as softer stools. This typically settles as your dog adjusts, or by giving the supplement with food. Dasuquin's added ASU can occasionally cause stomach upset in sensitive dogs. Speak to your vet if symptoms persist.

Yes — Nutramax produces cat-specific Cosequin formulations, dosed appropriately for feline use. Always use a product labelled for cats rather than a dog-only formula.

Nutramax's Denamarin and Denosyl are the leading options, both built around SAMe (S-Adenosylmethionine) to support liver cell function and repair.

Denosyl delivers SAMe on its own, with a focus on supporting glutathione levels and brain as well as liver health. Denamarin combines SAMe with silybin, a concentrated milk thistle extract, adding further antioxidant support for the liver. Denamarin is generally the pricier of the two given the added ingredient.

SAMe is a naturally occurring compound involved in liver cell repair and antioxidant (glutathione) production. Denosyl and Denamarin deliver it in a stabilised, enteric-coated tablet designed for reliable absorption.

This varies by dog and the underlying liver condition, and is best judged by your vet through follow-up bloodwork rather than a fixed timeline — some owners report noticing a difference within a couple of months of consistent use.

Both are generally well tolerated. Uncommon side effects can include reduced appetite, vomiting or diarrhoea. Contact your vet if you notice any of these.

For best absorption, these enteric-coated tablets are typically given on an empty stomach, around an hour before a meal. Follow the guidance on your product's label or from your vet, as dosing advice can vary slightly by formulation.

Yes, they're commonly used as an ongoing daily supplement for pets with chronic liver conditions or age-related liver support, with your vet adjusting the dose over time as needed.

Generally yes, since they target different systems and there's no known interaction between them, but it's worth confirming with your vet, especially if your dog has an existing health condition or takes other medication.

Yes — Cosequin in particular is one of the most widely vet-recommended retail joint supplements, with ingredients backed by extensive research, and the wider Nutramax range is a long-established name in veterinary-grade pet supplements.

Boss Pets is a trusted UK stockist for the Nutramax range, including Cosequin, Dasuquin, Denamarin and Denosyl, with fast UK delivery and correctly labelled, genuine stock.