FluidFlex wins this comparison by the narrowest margin in our Joint Health database — 5.7 to 5.6. Neither product earns anything better than a Use With Caution badge.
The deciding factor is Value (13/15 vs 8/15). FluidFlex costs $1.14/day; Next Level costs $1.98/day. Both deliver the same 5,000 mg glucosamine dose (DA = 3/20 for both), but FluidFlex does it for 42% less money.
Next Level’s real edge: the NASC Quality Seal. It scores 6/15 on QA versus FluidFlex’s 1/15, the widest QA gap between any two Caution-badge products in our database.
If you’ve already decided you want a Farnam liquid and the grocery budget is the constraint, FluidFlex is the buy. Cheaper, same dose, same failure mode.
Skip FluidFlex only if you care specifically about independent third-party oversight of manufacturing. The NASC seal on Next Level provides audited label accuracy and adverse event reporting that FluidFlex has no equivalent for. That’s the $0.84/day premium, and it’s a real purchase, not a marketing claim.
Full audit reports linked at the bottom of this page.
The Scores
| FluidFlex | Next Level | |
|---|---|---|
| Overall | 5.7 | 5.6 |
| Label Transparency | 12 / 15 | 13 / 15 |
| Ingredient Form | 16 / 20 | 15 / 20 |
| Dosing Adequacy | 3 / 20 | 3 / 20 |
| Formula Design | 12 / 15 | 11 / 15 |
| Quality Assurance | 1 / 15 | 6 / 15 |
| Value | 13 / 15 | 8 / 15 |
| Badge | Use With Caution | Use With Caution |
| Cost/day | $1.14 | $1.98 |
In our 15-product Joint Health database, FluidFlex and Next Level sit in the 10th-to-15th range overall. Both trigger Use With Caution on DA ≤ 5. They’re the two liquid-format joint supplements from the same parent company (Farnam), priced differently despite delivering the same underdosed primary active.
$0.84 a Day for the Same Dosing Problem
The Value gap is the story. FluidFlex costs $1.14/day at the 64 oz size. Next Level costs $1.98/day at the 32 oz. Both deliver 5,000 mg of glucosamine per 1 oz serving and score 3/20 on Dosing Adequacy — the exact same underdosing. FluidFlex does it for 42% less money. Over a year, that’s $307 saved on a product that’s functionally identical on the dimension that matters most.
FluidFlex also uses glucosamine HCl rather than Next Level’s sulfate form. HCl delivers more active compound per milligram than sulfate by weight, and equine absorption studies show higher bioavailability (Laverty et al., 2005). On top of that, FluidFlex provides 100 mg of chondroitin versus Next Level’s 14.5 mg. Neither amount approaches the 2,500 mg threshold, but 100 mg is an ingredient you can point to on a label. 14.5 mg is a rounding error.
The shared failure mode is worth naming. FluidFlex and Next Level both carry the Use With Caution badge for the same reason: DA ≤ 5. If you’ve already committed to a Farnam liquid format, the cheaper one is the rational choice.
Translate the Value gap into annual impact. At $1.14/day versus $1.98/day, FluidFlex saves $307 per year for a horse on year-round joint support. For a barn with three horses on joint supplements, that’s $921 annually — enough to cover a farrier cycle, a set of pads, or the vet’s spring shots. The two products aren’t different on outcome; they’re different on how much money leaves the account for equivalent delivery. When the underlying formula is equally underdosed, the product that wastes less money is the better product.
Why the Quality Assurance gap doesn’t rescue Next Level. Next Level scores 6/15 QA (NASC-certified) versus FluidFlex’s 1/15. That 5-point spread shrinks the overall gap but doesn’t close it. Reason: QA documentation tells you the product is what the label says. It does not tell you that what’s on the label is enough. Both labels say 5,000 mg of glucosamine, both are 50% of therapeutic threshold, both earn the Caution badge. Verifying that underdosing is accurate doesn’t change the fact that it’s underdosing. You’re paying an extra $0.84/day for a paper trail on a product already flagged for inadequate dosing.
FluidFlex’s 13/15 Value is tied with KPP Joint Armor for the highest in our 15-product Joint Health database. Next Level’s 8/15 places it mid-tier, a ranking driven almost entirely by the $1.98 price tag on a product with the same dose as products half its cost.
Where Next Level’s NASC Seal Earns Its Keep
Next Level scores QA = 6/15 versus FluidFlex’s 1/15. That 5-point gap comes from one credential: the NASC Quality Seal on Next Level’s bottle. NASC membership requires FDA cGMP compliance, adverse event reporting, and label accuracy audits. FluidFlex has none of that documentation — just a “Made in USA” claim.
For an owner who’s had a label-accuracy problem before, or one who wants independent third-party oversight rather than the manufacturer’s own claims, that’s what the $0.84/day buys. It doesn’t change what’s in the bottle. It changes what you can verify about what’s in the bottle.
Next Level’s QA = 6/15 is the highest among Use With Caution products in our Joint Health database. The only products scoring higher are the Recommended-badge Cosequin variants (also at 6/15) and Joint 6-in-1 at 8/15. For a Caution-badge product, NASC oversight is a real differentiator.
What’s in Each Ounce
| Ingredient | FluidFlex (1 oz) | Next Level (1 oz) | Threshold |
|---|---|---|---|
| Glucosamine | 5,000 mg (HCl, shellfish) | 5,000 mg (Sulfate, shellfish) | 10,000 mg |
| MSM | — | 1,750 mg | 10,000 mg |
| Chondroitin Sulfate | 100 mg (poultry) | 14.5 mg (poultry) | 2,500 mg |
| Yucca Schidigera | 250 mg | — | — |
| Ascorbic Acid (Ester-C) | — | 30 mg | 1,000 mg |
| Bromelain | — | 37 mg | — |
| Perna Mussel | — | 3.5 mg | — |
| Serving (maintenance) | 1 fl oz/day | 1 fl oz/day | — |
| Cost/day | $1.14 | $1.98 |
Which One for Your Horse
Buy FluidFlex if: you’ve decided on a liquid joint supplement for a specific reason (a picky eater, a top-dress syringe setup, a horse that rejects pellets and powders) and your budget is tight. At $1.14/day it’s the cheaper of the two Farnam liquids and uses the more-absorbed HCl glucosamine form. You’re not solving a joint problem; you’re giving your horse some glucosamine in a format they’ll eat.
Buy Next Level only if: you’ve had a past experience where a supplement’s label didn’t match what was in the bottle, or you’re managing a situation where NASC adverse-event reporting matters (a horse with a history of reactions to supplements, for example). The seal isn’t marketing. It’s audited oversight. That’s the specific reason to pay $0.84/day extra for the same underdosing.
For anyone with budget headroom above $1.50/day, skip both. A pellet or powder at 10,000 mg glucosamine (Flex+Max at $1.75 earns Recommended) does more actual joint work than either of these liquids at any price.
Frequently Asked Questions
Why does Farnam sell two liquid joint supplements that both fail on dosing?
FluidFlex and Next Level target slightly different buyers. FluidFlex is a budget-focused glucosamine liquid. Next Level adds MSM and Perna mussel for a broader formula and carries the NASC seal. Both are priced and formulated as maintenance-level liquids, not therapeutic-dose supplements. The issue is that neither label communicates this distinction. Both say “joint support” without flagging that the doses sit below clinical thresholds.
Would mixing both products give me full doses?
Combining 1 oz of each gives you 10,000 mg total glucosamine, 1,750 mg MSM, and 114.5 mg chondroitin at a combined cost of $3.12/day. The glucosamine hits threshold, but MSM and chondroitin still fall far short. Compare that to SmartFlex Ultra at $1.84/day or Flex+Max at $1.75/day. Both deliver full glucosamine doses with dramatically better MSM and chondroitin levels in a single product.
I’m already using Next Level. Should I switch to FluidFlex?
If you chose Next Level specifically for the NASC seal, stay put. You’re paying for documented oversight, not the formula. If you picked it because it was on the shelf or because Farnam’s brand felt safer, switching to FluidFlex saves $0.84/day with no meaningful loss in actual joint support. Transition over 7-10 days by tapering one product while ramping the other.
Sources
- Full audit report: FluidFlex — complete scoring calculations, label analysis, and sources.
- Full audit report: Next Level Joint Fluid — complete scoring calculations, label analysis, and sources.
- Laverty S, Sandy JD, Celeste C, et al. Synovial fluid levels and serum pharmacokinetics in a large animal model following treatment with oral glucosamine at clinically relevant doses. Arthritis & Rheumatism. 2005;52(1):181-191. PubMed ID: 15641050. Establishes 10,000 mg/day glucosamine therapeutic threshold and HCl vs sulfate bioavailability data.
- National Animal Supplement Council. Quality Seal Program requirements and audit process. nasc.cc. Accessed April 2026. Source for NASC Quality Seal compliance criteria (FDA cGMP, adverse event reporting, label accuracy audits).
- EquineAuditLab Methodology. Badge system hierarchy and Dosing Adequacy thresholds. /methodology/. Explains why DA ≤ 5 triggers Use With Caution regardless of total score.
Read the full audits: FluidFlex (5.7) | Next Level Joint Fluid (5.6)