For medium and large dogs that resist swallowing pills — or for owners who find mealtime supplement routines easier with a powder format — Ocu-GLO PB XL delivers the same comprehensive ophthalmologist-formulated antioxidant protection as the original Ocu-GLO gelcap, in a format that simply opens and sprinkles. The "PB" stands for Powder Blend, and the "XL" designates the larger, higher-concentration dose appropriate for dogs weighing 11 lbs and above. With 90 capsules per bottle, this is the most economical Ocu-GLO option for consistent long-term supplementation in bigger dogs.
Developed by Animal Necessity — a company founded and guided by board-certified veterinary ophthalmologists — Ocu-GLO PB XL is grounded in the same AREDS (Age-Related Eye Disease Study) research foundation as the entire Ocu-GLO line. The formula contains 12 antioxidants selected specifically for their mechanisms of action in protecting the cornea, lens, retina, and the vascular structures that supply them. This is not a general-purpose antioxidant blend repurposed for pets — it was built from scratch around the specific physiology of the canine eye.
The proprietary GLO blend forms the core: FloraGLO® Lutein at pharmaceutical grade, Grape Seed Extract delivering proanthocyanidins that target reactive oxygen species in the lens epithelium, and Omega-3 fatty acids (EPA and DHA) supporting retinal membrane structure and ocular vascular health. Each of these three ingredients has its own body of peer-reviewed evidence in eye health — the GLO blend concentrates them together in doses calibrated for real-world efficacy in dogs.
The formula is further supported by Vitamin C (100 mg per capsule), Vitamin E, Alpha Lipoic Acid (25 mg), Coenzyme Q10 (25 mg), Green Tea Leaf Extract (40 mg, 50% EGCG), Astaxanthin (2 mg), Rutin (10 mg), Zinc (5 mg), Niacin, and the full B-vitamin complex. The XL version contains approximately double the active ingredient load of the standard PB, reflecting the higher body weight and correspondingly greater antioxidant demand of larger dogs.
The capsule is easy to open and sprinkle — palatable powder that mixes easily into wet or dry food. NASC quality-seal certified, made in the USA, gelatin-free capsule (hypromellose), and soy-free.
Key Ingredients (per 1g capsule)
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GLO Proprietary Blend – 351 mg (Grape Seed Extract, FloraGLO® Lutein, Omega-3 EPA/DHA) — double-strength core antioxidant triad for medium/large dog dosing
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Vitamin C (Ascorbic Acid) – 100 mg — potent water-soluble antioxidant and tissue repair co-factor
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Green Tea Leaf Extract (50% EGCG) – 40 mg — highly concentrated polyphenol with anti-inflammatory and ROS-scavenging action
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Vitamin E (d-Alpha Tocopherol Succinate) – 33.5 mg — fat-soluble antioxidant protecting photoreceptor cell membranes
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Alpha Lipoic Acid – 25 mg — universal antioxidant that regenerates depleted Vitamin C and E within the cellular cycle
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Coenzyme Q10 – 25 mg — mitochondrial energy support for the metabolically demanding retinal cells
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Rutin – 10 mg — bioflavonoid supporting ocular capillary strength and permeability regulation
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Zinc (Zinc Oxide) – 5 mg — essential cofactor for superoxide dismutase and retinal antioxidant enzyme systems
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Astaxanthin – 2 mg — crosses the blood-retinal barrier; exceptional free radical quenching capacity in ocular membranes
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B-Vitamin Complex (B1, B3, B5, B6, B7, B9, B12) — nerve signal support and cellular energy metabolism throughout the visual system
Directions for Use
| Dog Weight |
Daily Dose |
| 11–30 lbs |
1 capsule daily |
| 31–60 lbs |
2 capsules daily |
| 61+ lbs |
3 capsules daily |
Open the capsule and sprinkle powder over food at mealtime. If multiple capsules are required, divide doses across two meals to improve digestive tolerance. The capsule may also be given whole if the dog accepts it. Not for use in cats. Do not use with anticoagulant medications. Not for dogs under 6 months of age. Safe for perioperative use.
Supplement Advisor's Note
The PB XL is the highest-concentration Ocu-GLO formulation available and is the best choice for large and giant breed dogs where antioxidant demand is greatest. The 90-count bottle is significantly more cost-efficient than the 30-count for dogs requiring 2–3 capsules daily — a 90-capsule bottle gives a large dog (31–60 lbs) a 45-day supply versus only 15 days from a 30-count. The powder format is particularly useful for food-motivated dogs where hiding supplements in a meal is the most reliable administration method. From a pharmacological standpoint, the doubled GLO blend dose (351 mg vs. 175 mg in the standard PB) ensures that lutein reaches adequate plasma and tissue concentrations in larger body masses — a detail that matters for efficacy and is often underdosed in generic "one-size" veterinary eye supplements.
Frequently Asked Questions
What is the difference between Ocu-GLO PB XL and the standard Ocu-GLO PB?
PB XL contains approximately double the active ingredient concentration per capsule (GLO blend: 351 mg vs. 175 mg) and is formulated for medium and large dogs weighing 11 lbs and above. The standard PB is for smaller dogs (1–10 lbs) and cats. Using the XL for a large dog means fewer capsules per dose, which is more convenient and more economical.
Can I give this to my dog who is already on eye drops or eye medication?
Yes — Ocu-GLO PB XL is designed to work alongside conventional veterinary eye treatments, not as a replacement. It supports the eye's intrinsic antioxidant defences while prescribed medications address specific disease processes. Always keep your veterinarian informed of all supplements your dog is receiving.
How does the powder blend compare to the gelcap in terms of absorption?
When sprinkled over food and consumed at mealtime, the powder content disperses readily through the digestive tract and is absorbed similarly to the gelcap. The powder format may actually be gentler on digestion for sensitive dogs since it mixes with food rather than being delivered as a concentrated bolus.
How long does the 90-capsule bottle last for my dog?
For a 30–60 lb dog (2 capsules daily), the 90-count bottle provides a 45-day supply. For a dog over 61 lbs (3 capsules daily), it lasts 30 days. For smaller dogs 11–30 lbs (1 capsule daily), it provides a full 90-day supply. The 90-count is the most economical size for larger dogs on ongoing supplementation.
Is this product safe to use before or after eye surgery?
Yes — Ocu-GLO is certified safe for perioperative use and is often continued through surgical recovery periods. This is one of the features that distinguishes it from many other supplements, as Grape Seed Extract's mild antiplatelet properties cause some supplements to be suspended pre-operatively. Always confirm with your veterinary ophthalmologist for your specific situation.
