Key Takeaways
- Overall score: 5.9 / 10 — The most ingredient-diverse formula at this price point, featuring all four core joint ingredients plus turmeric, olive fatty acids, and yucca — but every scored ingredient except HA is significantly underdosed.
- All four core joint ingredients present: glucosamine, chondroitin, MSM, and hyaluronic acid. This is only the second product in our database (after SmartFlex Ultra) to include all four. However, three of the four are dosed below 25% of their therapeutic thresholds.
- Sodium hyaluronate at 100 mg meets the full therapeutic threshold — matching KPP Joint Armor as the joint products in our database reaching 100% for HA.
- Glucosamine at 5,000 mg (50% of threshold), MSM at 2,000 mg (20%), and chondroitin at 200 mg (8%) are all substantially underdosed. The MSM dose is the lowest among any product in our database that includes it.
- Formula Design scores 14/15 — the highest in our database — driven by all four core ingredients, four supporting ingredients, and three non-baseline differentiators (turmeric, olive fatty acids, yucca).
- Boswellia serrata is present but listed as an inactive ingredient inside a proprietary blend (“Bolswelloe-B Blend”), so it cannot be scored as an active with a quantified dose.
Label Transparency — 13 / 15
Finish Line Fluid Action HA Powder provides strong label transparency. Nine active ingredients are individually quantified per scoop: glucosamine HCl at 5,000 mg, MSM at 2,000 mg, ascorbic acid at 1,000 mg, olive fatty acids at 300 mg, turmeric at 200 mg, yucca at 200 mg, chondroitin at 200 mg, sodium hyaluronate at 100 mg, and vitamin D3 at 1,000 IU. No proprietary blends are used for the active ingredients — though the inactive ingredient section includes a proprietary “Bolswelloe-B Blend” (aloe vera, boswellia serrata, B vitamins).
Source disclosure covers two of the three source-relevant ingredients present. Glucosamine is identified as shellfish-derived (confirmed on multiple retailer listings). Chondroitin is identified as porcine-sourced (from Chewy’s ingredient panel). Hyaluronic acid is stated as sodium hyaluronate but the biological source species is not disclosed. Serving size (12–13 g scoop), days per container, full inactive ingredient list, and a dosing reference for a 1,000 lb horse are all provided. No trademarked ingredient specifications are used.
Ingredient Form — 16 / 20
Form quality across the eight scored ingredients is good, anchored by the preferred glucosamine HCl form with verified shellfish source (4/4) and ascorbic acid as a named vitamin C form (4/4). Chondroitin from a specified porcine source earns 3/4 — source is disclosed but it is not the optimal low-molecular-weight marine form. Sodium hyaluronate without a stated source earns 3/4. MSM is standard methylsulfonylmethane (3/4). Turmeric, yucca, and olive fatty acids are not in our form lookup table and receive the default 3/4 score each.
Average form score: (4+3+3+3+4+3+3+3) / 8 = 3.25. Dimension score: 3.25 × 5 = 16.25, rounded to 16/20. This matches Farnam FluidFlex for the highest Ingredient Form score in our database, driven by the glucosamine HCl + shellfish combination and the explicit sodium hyaluronate designation for HA.
Dosing Adequacy — 7 / 20
For joint health supplements, four ingredients are scored against therapeutic thresholds for a 500 kg horse:
Glucosamine (primary, threshold 10,000 mg): 5,000 mg delivered — 50% of the therapeutic threshold. This is the same half-dose seen in FluidFlex and KPP Joint Armor. Score: 3 / 8.
MSM (secondary, threshold 10,000 mg): 2,000 mg delivered — 20% of the threshold. This is the lowest MSM dose among any product in our database that includes it, falling below the 25% minimum for any points in this sub-score. Score: 0 / 4.
Chondroitin sulfate (secondary, threshold 2,500 mg): 200 mg delivered — 8% of the therapeutic threshold. Like the MSM, this falls below 25% and earns zero points despite the ingredient being present. Score: 0 / 4.
Hyaluronic acid (secondary, threshold 100 mg): 100 mg delivered as sodium hyaluronate — 100% of the therapeutic threshold. Full score. Score: 4 / 4.
Total: 3 + 0 + 0 + 4 = 7 / 20. The product includes all four scored ingredients but three of them are dosed so far below threshold that they earn zero points. Only HA delivers a clinically meaningful dose.
Formula Design — 14 / 15
This is the highest Formula Design score in our database, surpassing Platinum CJ’s 13/15.
Core completeness: All four core joint ingredients are present — glucosamine, chondroitin, MSM, and hyaluronic acid. This is the only product besides SmartFlex Ultra to achieve a full core complement. Score: 6 / 6.
Supporting ingredient breadth: Four quantified active ingredients beyond the core four: vitamin C (1,000 mg), olive fatty acids (300 mg), turmeric (200 mg), and yucca (200 mg). Score: 4 / 5.
Formula differentiation: Three non-baseline ingredients at meaningful doses: turmeric (200 mg, no threshold defined, quantified — anti-inflammatory mechanism distinct from glucosamine/chondroitin), olive fatty acids (300 mg, quantified — omega-rich essential fatty acids for joint membrane support), and yucca (200 mg, quantified — traditional anti-inflammatory). Three non-baseline actives ≥ 2 required. Score: 4 / 4.
Total: 6 + 4 + 4 = 14 / 15. The single lost point comes from breadth — a fifth supporting ingredient would have earned the maximum. Note that boswellia serrata is present in the formula but listed as an inactive ingredient in a proprietary blend, so it cannot contribute to any Formula Design sub-score.
Quality Assurance — 1 / 15
No NSF Certified for Sport or Informed Sport certification. No Certificate of Analysis publicly available or stated as available on request. A SmartPak reviewer notes that “ingredients are sourced in the U.S.A., and formulated by in-house chemists,” but no explicit cGMP facility certification or documented QC program appears on the product page or the Finish Line brand website. Made in the USA — country of origin is the only verifiable quality claim.
Important context: This score reflects publicly available documentation, not a judgment of actual product quality. Finish Line Horse Products has been in the equine supplement market for over two decades with a reputation for effective joint formulas and in-house formulation. The company can improve this score by publishing COAs, obtaining third-party certification, or describing their manufacturing QC program publicly. We welcome Finish Line to contact us at contact@equineauditlab.com with updated documentation.
Value — 8 / 15
Cost Per Effective Day (CPED): Using the 30-Ounce tub ($55.95 on Amazon, approximately 30 servings at 1 scoop/day): $55.95 ÷ 30 days = $1.87 per day. Score: 5 / 8.
Cost Per Gram of Primary Active (CPG): $1.87 ÷ 5 g glucosamine = $0.37 per gram. Score: 1 / 5.
Size options: Three sizes available (1.2 lb, 2.4 lb, 4.8 lb) with per-day savings on larger sizes. Score: 2 / 2.
Total: 5 + 1 + 2 = 8 / 15.
Context on Value: At $1.87 per day, this product sits in the middle of our database — more expensive than FluidFlex ($0.85), KPP Joint Armor ($1.00), and Cosequin ASU ($1.73), but cheaper than SmartFlex Ultra ($1.84) on a daily basis. However, the cost per gram of glucosamine ($0.37/g) is the second highest after Platinum CJ, because the 5,000 mg dose means you pay a mid-range daily price for a half-dose of the primary active.
The Bottom Line
Finish Line Fluid Action HA Powder earns the highest Formula Design score in our database (14/15) by combining all four core joint ingredients with turmeric, olive fatty acids, yucca, and vitamin C — a notably diverse formula that approaches joint health from multiple mechanisms. The 100 mg sodium hyaluronate dose matches the full therapeutic threshold. But the formula’s ambition outstrips its dosing: glucosamine at 50%, MSM at 20%, and chondroitin at 8% of their respective thresholds mean three of the four core ingredients are present more as formula line items than as therapeutic agents. At $1.87 per day, you are paying a mid-range price for breadth without depth. The horse owner who values ingredient diversity over dose potency — or who stacks this with a separate glucosamine supplement — may find Fluid Action HA worth the investment. For owners seeking a single product that delivers therapeutic doses across the board, SmartFlex Ultra at $1.84/day offers full-dose glucosamine and MSM at a comparable daily cost. Overall: 5.9/10.
Product Specifications
| Specification | Detail |
|---|---|
| Brand | Finish Line Horse Products, Inc. |
| Product | Fluid Action HA Powder |
| Form | Powder |
| Serving size | 1 scoop (12–13 g) maintenance / 2 scoops loading (first 8 days) |
| Container sizes | 1.2 lb (~45 days) / 2.4 lb (~90 days) / 4.8 lb (~180 days) |
| Servings per container (4.8 lb) | ~180 days at maintenance dose |
| Price (1.2 lb) | $55.95 (Amazon 30-Ounce, accessed April 2026) |
| Cost per day | ~$1.87 (30 oz) |
| Country of origin | USA |
| Sport safety | No certification or formulation statement |
Active ingredients per 1-scoop maintenance serving:
| Ingredient | Amount | Threshold (500 kg horse) | % of Threshold |
|---|---|---|---|
| Glucosamine HCl (shellfish) | 5,000 mg | 10,000 mg | 50% |
| MSM | 2,000 mg | 10,000 mg | 20% |
| Ascorbic Acid (Vitamin C) | 1,000 mg | 1,000 mg | 100% |
| Olive Fatty Acids (EFA) | 300 mg | — | — |
| Turmeric Powder | 200 mg | — | — |
| Yucca Powder | 200 mg | — | — |
| Chondroitin (porcine source) | 200 mg | 2,500 mg | 8% |
| Sodium Hyaluronate | 100 mg | 100 mg | 100% |
| Vitamin D3 | 1,000 IU | — | — |
Frequently Asked Questions
Is Fluid Action HA a complete joint supplement on its own?
It contains all four core joint ingredients plus four supporting actives — the broadest formula in our database. However, three of the four core ingredients (glucosamine at 50%, MSM at 20%, chondroitin at 8%) are far below therapeutic thresholds. The ingredient diversity is excellent, but the doses are not sufficient for standalone joint support in a horse with active needs.
How does Fluid Action HA compare to SmartFlex Ultra?
Fluid Action HA scores 5.9 vs SmartFlex Ultra’s 6.8. Fluid Action HA has a higher Formula Design score (14/15 vs 9/15) with more ingredient diversity, including turmeric and olive fatty acids. SmartFlex wins decisively on dosing (17/20 vs 7/20) — it delivers double the glucosamine and five times the MSM. SmartFlex costs about the same per day ($1.84 vs $1.87).
Sources
- Finish Line — Fluid Action HA Powder Official Product Page (accessed April 8, 2026). Product description, active ingredients per serving, inactive ingredient list including Bolswelloe-B Blend composition, dosing instructions, pricing ($100.95–$427.20 range across sizes).
- Chewy — Finish Line Fluid Action HA Powder 2.4 lb (accessed April 8, 2026). Full active and inactive ingredient panels, scoop size (20-cc / 12g), chondroitin source identified as porcine.
- PBS Animal Health — Fluid Action HA (accessed April 8, 2026). Per-scoop ingredient amounts confirmed: 100 mg sodium hyaluronate, 5,000 mg glucosamine HCl, 2,000 mg MSM, 1,000 mg ascorbic acid, 300 mg olive fatty acids, 200 mg turmeric, 200 mg yucca, 200 mg chondroitin, 1,000 IU vitamin D3.
- Valley Vet Supply — Fluid Action HA Powder (accessed April 8, 2026). Cross-check of ingredient amounts and dosing instructions.
- Jacks Inc — Finish Line Fluid Action HA (accessed April 8, 2026). Glucosamine source confirmed as shellfish. Liquid vs powder ingredient comparison.
- SmartPak — Fluid Action HA New & Improved (accessed April 8, 2026). Customer reviews, “ingredients sourced in the U.S.A.” claim, and SmartPak product description noting 100 mg HA, 5,000 mg glucosamine, 200 mg chondroitin.
- National Research Council. Nutrient Requirements of Horses, 6th Revised Edition. National Academies Press, 2007. Referenced for clinical dosing benchmarks (500 kg horse).