Moderate evidenceJoints & skin

ASU (Avocado Soybean Unsaponifiables)

ASU at 300 mg/day meaningfully reduces pain and improves function in knee osteoarthritis across pooled placebo-controlled trials, but the same analyses show no benefit in hip OA. Claims that it slows joint structural damage failed their key long-term test.

What the science says

Knee osteoarthritis symptoms Moderate evidence
A 2019 meta-analysis of randomised placebo-controlled trials found ASU reduced VAS pain by 9.6 mm overall (95% CI -17.4 to -1.8), and in the knee subgroup by 17.4 mm along with a 2.33-point drop in the Lequesne index. Heterogeneity was high (I² 87-92%), so the precise magnitude is uncertain.
Hip osteoarthritis and structure modification Limited evidence
In the same meta-analysis the hip subgroup showed no significant benefit on either VAS or Lequesne index. The 3-year ERADIAS trial in hip OA also missed its primary structural endpoint of joint space narrowing, and the 2008 meta-analysis concluded symptomatic benefit was better supported than structural claims.
Analgesic and NSAID sparing Moderate evidence
Trials lasting 3-6 months consistently report reduced NSAID and rescue analgesic consumption alongside symptom improvement, which is the most practically relevant finding for people trying to limit NSAID exposure.

Dosage & safety

Studied dose300 mg/day of the standardised one-third avocado / two-thirds soybean unsaponifiable fraction (the Piascledine 300 formulation), taken with a meal. Onset is slow — allow 2 months before judging. 600 mg/day has been tested and offers no additional benefit.

SafetyAdverse events in trials are no more frequent than placebo (relative risk 1.02, 95% CI 0.83-1.25). Reported effects are mild: gastrointestinal upset, reflux, occasional headache. Regulatory note: ASU is a prescription medicine in France and several other countries and is sold as a dietary supplement in the US, so standardisation outside the prescription product varies considerably. Avoid with avocado or soy allergy. Not studied in pregnancy or breastfeeding; no established drug interactions.

Scientific references

Efficacy and safety of avocado-soybean unsaponifiables for the treatment of hip and knee osteoarthritis: A systematic review and meta-analysis of randomized placebo-controlled trials
Simental-Mendía M, Sánchez-García A, Acosta-Olivo CA, Vilchez-Cavazos F, Osuna-Garate J, Peña-Martínez VM, Simental-Mendía LE — International Journal of Rheumatic Diseases, 2019
Symptomatic efficacy of avocado-soybean unsaponifiables (ASU) in osteoarthritis (OA) patients: a meta-analysis of randomized controlled trials
Christensen R, Bartels EM, Astrup A, Bliddal H — Osteoarthritis and Cartilage, 2008

Where to buy

Swanson Vitamins, AvoVida®, Maximum Strength, 300 mg, 60 Capsules

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