1 8

As Your Cat Gets Older, Their Immune System Needs More Support

$19.95
$19.95
Sale Sold out
Immune Support
gut defense
respiratory health

Your cat acts unbothered. Their immune system? Not so much. L-Lysine is the one amino acid cats can't make on their own — and without it, a super common feline virus turns into chronic sneezing, goopy eyes, and general sad cat vibes. One scoop over their food and they're back to judging you from across the room.

Style
Size

serving instructions

Add one scoop to your cat's food once daily. For best results, use consistently as part of your cat's everyday routine. Most cats begin showing improvements in immune and gut health within 2–4 weeks.

CAT AGE SERVING / DAY
below 6 months ½ Scoop
over 6 months 1 Scoop
ICON

Not sure? We offer a complete 60 day money back guarantee if your pet doesn’t love their Daybreak products.

ICON

Free Shipping! We offer free shipping on all orders $50+.

View full details

900mg L-Lysine

Made in USA

3rd Party Tested

No Soy/No Corn

Chicken Broth Flavor

Care for rescue cats? know this patterns

FHV-1 shows up in the same patterns. If your cat has any of these, L-Lysine may help.

  • Cats that came from shelters
    and never fully cleared their URI 
  • The sneezing and eye discharge
    that cycles every few weeks
  • Rounds of antibiotics that helped temporarily but didn't stick 
  • Multiple cats — treating them all is expensive and time-consuming 
  • Community or feral cats you feed
    outdoors who need immune support
  • Post-antibiotic gut recovery — cats who seem off even after clearing inspection
files/Create_a_hyper-realistic_202604180232.png

If any of these sound familiar, your cat's immune system is likely fighting feline herpesvirus (FHV-1) — the most common cause of recurring eye and respiratory symptoms in cats. There is no cure for FHV-1, but the symptoms are absolutely manageable. L-Lysine is the most widely recommended intervention, and Daybreak delivers it at the dose that matters — 900mg — combined with three supporting ingredients most formulas don't include.

What’s actually happening in your cats body

Shelter stress is a significant immune suppressor. Cats in shelters are exposed to a high density of other animals, unfamiliar environments, and viral loads they've never encountered. FHV-1 — feline herpesvirus — spreads easily in these settings and goes dormant in the body. When a cat enters a new home, the stress of transition
can trigger a flare-up. L-Lysine is the foundational immune support tool for cats with FHV-1

and most shelter cats have it. By consistently supplementing with L-Lysine, you give your cat's immune system the building block it needs to keep the virus suppressed. Daybreak adds Krill Omega-3 for airway inflammation, and FOS Prebiotic specifically to support gut microbiome recovery after antibiotics — something the rescue community deals with constantly.

Not just Lysine. A complete formula

Most lysine supplements contain one ingredient. Daybreak contains four — because FHV-1 affects more than one system in your cat's body.

files/Group_1171275614.png
HERO INGREDIENT

L-Lysine (900mg)

VIRAL IMMUNE SUPPORT

The cornerstone supplement for FHV-1 management. At 900mg per serving, it's in the therapeutic range most vets target. One scoop per adult cat — simple to scale across a multi-cat household.

files/Clip_path_group_1_3fa3cb8a-14d2-4c83-84b4-e6ee2c4345c0.png
PREBIOTIC

FOS Prebiotic (400mg)

GUT MICROBIOME SUPPORT

Reduces airway inflammation. Particularly helpful for cats coming out of URI flare-ups where secondary inflammation keeps them congested even after the virus is suppressed.

files/Group_1171275613.png
OMEGA-3

Krill Meal (250mg)

AIRWAY & EYE INFLAMMATION

After antibiotics, beneficial gut bacteria are depleted — this prebiotic feeds them back. Healthier gut = stronger immune response = faster recovery.

files/Clip_path_group_a09c5aa5-118d-4b3d-91d0-b6dd80aba5e2.png
IMMUNE MODULATION

DMG (50mg)

ENERGY & IMMUNE RESPONSE

Supports immune modulation and energy metabolism. Helps cats with compromised immune systems (FIV+, feline leukemia, or simply chronically stressed) maintain better baseline health.

Real ingredients

MAnufactured IN THE USA

NO FILLERS OR JUNK

Non gmo

BEHIND THE SCENES

poster

poster

poster

poster

poster

Why Daybreak — Not the brand at your vet's office

"The stuff the vet wanted to give me had 400mg of L-Lysine less and was $50 more." — Verified Amazon Purchase

Leading pet supplements
Product Image
L-Lysine per serving
500mg
900mg
Additional active ingredients
Lysine only
Krill + FOS Prebiotic + DMG
Manufactured in the USA
Third-party tested
No soy / no corn / no additives
Price
$20–50 more for less
Affordable
shop now

When will I see results?

line

DAYS 1–3

Your cat begins eating the powder in wet food. Palatability confirmed. No visible change yet — completely normal.

DAYS 4–7

Many owners report first improvements in eye discharge and sneezing. Immune support has begun building.

WEEKS 2–4

Consistent daily use builds up. Most cats show meaningful symptom reduction. Energy often improves noticeably.

MONTH 2+

Maintenance phase. Daily use suppresses flare-up frequency — many cats go months without a visible episode.

Frequently Asked Questions

Can I use this for FIV+ cats?
  • Yes. L-Lysine supports overall immune modulation — it is not contraindicated for FIV+ cats. Many rescue owners specifically use it for immunocompromised cats. Always consult your vet for cats with serious underlying conditions.
I have 6 cats. Is there a more economical option?
  • Consider purchasing a 3-pack for a consistent supply at a reduced per-unit cost. A 60-serving pouch lasts one adult cat 60 days, or 6 cats approximately 10 days. Multi-cat households typically buy monthly.
Is this safe to give continuously, or should I cycle it?
  • L-Lysine is safe for continuous daily use. Most veterinarians recommend ongoing daily supplementation for cats with FHV-1 rather than cycling, as consistent L-Lysine levels provide better ongoing viral suppression.
My rescue cat just finished a round of antibiotics. Can I start this right away?
  • Yes — and in fact the FOS prebiotic in this formula is particularly helpful immediately post-antibiotics, as it helps restore the gut microbiome that antibiotics deplete.
Can I use this for outdoor or feral cats?
  • Yes. Many community cat caretakers in our customer base use it mixed into wet food for their outdoor colonies. The chicken broth and krill flavor is generally well- accepted even by cats that are not hand-tame.
files/Group_1.png

Give your cat's immune system the support it needs.

Join thousands of cat owners who've made Daybreak L-Lysine part of their daily routine. 60 servings. One scoop. Results most owners notice within the first week.

  • Save 20% every order
  • Delivered automatically
  • Cancel everytime
  • Never run out
Start a subscription try it once