Condition

Acute Nonspecific Knee Pain

Acute nonspecific knee pain is knee soreness without an obvious structural cause like a ligament tear, often from overuse, strain, or muscle imbalance. Among supplements, bromelain, boron, and glucosamine have the most to show: inflammation went down with bromelain, knee pain improved with boron, and rehabilitation rates improved with glucosamine. Still, the evidence is limited, since these studies were small, with 60 to 102 people each.

Sources: PMID 24940052

Supplements studied: 3
Graded outcomes: 4
Trials: 3
People studied: 239

Evidence by supplement

Strong
Moderate
Limited
Very limited

3 supplements

Boron

Boron: outcomes studied for Acute Nonspecific Knee Pain
Grade	Outcome	Effect	Size	Studies	People
	Pain Moderate Improvement	Improves (the measure goes down)	Moderate effect	1 study	60 people
Studies that measured pain Short-term efficacy of calcium fructoborate on subjects with knee discomfort: a comparative, double-blind, placebo-controlled clinical studyClin Interv Aging · PMID 24940052
	Range of Motion Moderate Increase	Improves (the measure goes up)	Moderate effect		60 people

Bromelain

Bromelain: outcomes studied for Acute Nonspecific Knee Pain
Grade	Outcome	Effect	Size	Studies	People
	Inflammation Small Decrease	Improves (the measure goes down)	Small effect		77 people
	Muscle Soreness	Changes; see studies		2 studies	77 people
Studies that measured muscle soreness Bromelain reduces mild acute knee pain and improves well-being in a dose-dependent fashion in an open study of otherwise healthy adultsPhytomedicine · PMID 12587686 Preliminary comparison of bromelain and Ibuprofen for delayed onset muscle soreness managementClin J Sport Med · PMID 12466693
	Subjective Well-Being	Improves (the measure goes up)			77 people

Glucosamine

Glucosamine: outcomes studied for Acute Nonspecific Knee Pain
Grade	Outcome	Effect	Size	Studies	People
	Injury Rehabilitation Rate Small Improvement	Improves (the measure goes up)	Small effect		102 people
	Range of Motion	Improves (the measure goes up)		1 study	102 people
Studies that measured range of motion Glucosamine administration in athletes: effects on recovery of acute knee injuryRes Sports Med · PMID 17578751

Key findings

PainBoronImproves (the measure goes down)
InflammationBromelainImproves (the measure goes down)
Injury Rehabilitation RateGlucosamineImproves (the measure goes up)

The Acute Knee Pain Relief & Recovery protocol

2 primary supplements · 6 supporting supplements

Curcumin500–1,000 mg enhanced-absorption curcumin 2–3 times daily
Bromelain500–2,000 GDU daily between meals

See the full protocol

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Studies cited

4 studies from PubMed

Glucosamine administration in athletes: effects on recovery of acute knee injuryRes Sports Med · PMID 17578751
Preliminary comparison of bromelain and Ibuprofen for delayed onset muscle soreness managementClin J Sport Med · PMID 12466693
Bromelain reduces mild acute knee pain and improves well-being in a dose-dependent fashion in an open study of otherwise healthy adultsPhytomedicine · PMID 12587686
Short-term efficacy of calcium fructoborate on subjects with knee discomfort: a comparative, double-blind, placebo-controlled clinical studyClin Interv Aging · PMID 24940052