The glycosaminoglycan that lubricates joints and plumps skin — FDA approved as an injectable medical device for knee OA and as a cosmetic dermal filler. Both are provider-administered.
Hyaluronic acid (HA) is a large glycosaminoglycan (GAG) polymer naturally abundant in skin, synovial joint fluid, and connective tissue. It holds ~1000× its weight in water, which is why it’s so effective as a lubricant, shock absorber, and skin volumizer. Injectable HA has two main clinical uses:
Both forms are FDA approved and prescription / provider-administered. Not WADA prohibited. Never self-inject — vascular occlusion risk is serious.
Restores the viscoelasticity of arthritic synovial fluid. Lubrication, shock absorption, and indirect CD44-mediated anti-inflammatory effects in the joint.
Injected HA binds water locally to plump the dermis and subcutaneous tissue. Cross-linking of the HA polymer determines how long the effect lasts (monophasic vs biphasic gels, low vs high molecular weight).
Unlike permanent fillers (silicone, PMMA), HA fillers can be dissolved with hyaluronidase if there’s a complication. That’s one of the main safety advantages of HA over alternatives.
| Use | Evidence |
|---|---|
| Knee OA pain | The largest analysis finds it equivalent to placebo. This page previously said "modest benefit over placebo in meta-analyses," which is the framing the best evidence specifically refutes — see below. Still widely used when NSAIDs fail and before surgery is considered, so the practice continues regardless of the data. |
| Other joints OA | Shoulder, hip: less evidence, off-label for most |
| Wrinkles / volume loss | Well-established cosmetic standard; results last 6–18 months depending on product |
| Lip augmentation | Huge market; FDA approved for multiple HA fillers |
| Under-eye hollows | Advanced technique; hyaluronidase reversibility critical given proximity to vessels |
Pereira 2022 in the BMJ (PMID 36333100) pooled 169 randomised trials and 21,163 participants, then ran its primary analysis on the 24 large placebo-controlled trials with at least 100 participants per group — 8,997 people. The result:
The analysis also documented small-study effects and publication bias for both pain and function — Egger's test P < 0.001 with asymmetric funnel plots. That is the explanation for why so many smaller reviews read positively: the small trials skew favourable and the large ones do not. It is the same pattern flagged on the Thymosin Alpha-1 page, where a large neutral trial sits against a positive pool of smaller ones.
This does not mean nobody improves after an injection — people plainly do, and the placebo response to an intra-articular procedure is substantial. It means the improvement is not attributable to the hyaluronic acid. Anyone weighing a course of injections should know the strongest evidence says equivalence, not benefit, before paying for it.
Build your protocol, log every dose, monitor your body's response, and get reminders so you never miss a dose.
Start Tracking FreeNot medical advice. These figures describe what is reported in the literature and what practitioners and communities do — not a recommendation, and for most compounds here no human dose-finding study exists. Talk to a qualified healthcare provider.
Facial vascular occlusion from misplaced HA can cause tissue necrosis, blindness, or stroke. Even experienced injectors occasionally have complications, and rapid hyaluronidase reversal is essential when they occur. This is the one compound in the library we flatly recommend against at-home use.
Pre-filled with a typical Hyaluronic Acid (Injectable) setup. Edit any field — the draw updates live.
Insulin syringe — 100 units = 1 mL
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Hyaluronic Acid (Injectable) is a prescription medication. StackTrax does not sell, prescribe, or facilitate purchase of prescription drugs.
Find a clinician who can order baseline lab work, screen for contraindications, monitor your response, and adjust dosing over time. Options to consider:
Before starting, you’ll typically want:
Avoid sources that offer prescription medications without labs, medical history, or licensed-provider oversight. If a telehealth service promises a prescription after a 5-minute questionnaire, that’s a red flag.
Build your protocol, log every dose, monitor your body's response, and get reminders so you never miss a dose.
Start Tracking FreeYes, in two forms. Intra-articular HA (Synvisc, Hyalgan, Orthovisc, Euflexxa, etc.) is FDA approved as a medical device for knee osteoarthritis. Dermal fillers (Juvederm, Restylane, RHA family, etc.) are FDA approved for various cosmetic indications such as wrinkles, volume restoration, and lip augmentation. Both forms are prescription or provider-administered. HA is not WADA prohibited.
Honestly, the best evidence says no. The largest meta-analysis — 169 trials and 21,163 participants, with the primary analysis run on 24 large placebo-controlled trials (Pereira 2022, BMJ, PMID 36333100) — found a pain reduction of SMD −0.08, equivalent to 2.0 mm on a 100 mm scale, with the confidence interval excluding the minimal clinically important difference. Its trial sequential analysis concluded there has been conclusive evidence of clinical equivalence to placebo since 2009. That analysis also found clear publication bias favouring small trials, which is why smaller reviews look better. An earlier version of this answer said meta-analyses show modest benefit; that was wrong. Viscosupplementation works by restoring the viscoelasticity of arthritic synovial fluid, providing lubrication, shock absorption, and indirect CD44-mediated anti-inflammatory effects in the joint. Clinically it is often used when NSAIDs fail and before surgery is considered. Evidence for shoulder, hip, and other joints is weaker and off-label for most.
Results typically last 6 to 18 months depending on the product and area. Mobile facial areas (lips, perioral) tend toward 6 to 12 months while static areas hold 12 to 18 months. Cross-linking of the HA polymer determines how long the effect lasts (monophasic vs biphasic gels, low vs high molecular weight). Per-treatment volume is usually 0.5 to 2 mL per area.
Yes. Unlike permanent fillers (silicone, PMMA), HA fillers can be dissolved with hyaluronidase if there is a complication. This is one of the main safety advantages of HA over alternatives and is essential for emergency management of vascular occlusion.
Facial vascular occlusion from misplaced HA can cause tissue necrosis, blindness, or stroke. Even experienced injectors occasionally have complications, and rapid hyaluronidase reversal is essential when they occur. HA is the one compound in the library StackTrax flatly recommends against at-home use. Injections must be done by a licensed provider (dermatologist, plastic surgeon, trained PA/NP).
Common effects across both indications include injection site bruising, swelling, pain, and transient redness. Cosmetic-specific risks include early palpable lumps or nodules (often resolves; dissolvable with hyaluronidase), delayed-onset inflammatory nodules or granulomas appearing weeks to months later, Tyndall effect (bluish tint) with superficial placement, and rare but devastating vascular occlusion. Any post-injection severe pain, blanching, dusky color change, vision change, or disproportionate bruising is an emergency requiring immediate hyaluronidase.
Do not inject HA at sites with active infection, in patients with known hypersensitivity to HA or product carriers, during pregnancy or breastfeeding (cosmetic), or with active autoimmune flare affecting the target area. Use caution with bleeding disorders, anticoagulants, and planned dental work within 2 weeks since oral bacteria can seed fresh filler sites.
Disclaimer: This guide is for educational and informational purposes only and is not intended as medical advice, diagnosis, or treatment. The compounds discussed are not FDA approved for human use. Always consult a qualified healthcare provider before starting any new supplement or peptide protocol. StackTrax does not sell peptides or supplements directly — purchase links go to third-party vendors. StackTrax is not responsible for the products, quality, or business practices of any third-party vendor.
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StackTrax guides cover peptides and compounds that are not FDA-approved for the uses discussed. The dosing, reconstitution, and safety information is compiled from published research and community protocols for educational purposes only.
Before using any compound mentioned here, consult a qualified healthcare provider. StackTrax does not sell, prescribe, or recommend these substances for personal use.