Tendinitis
Tendinitis is categorized as a musculoskeletal condition. A fuller description of its symptoms, causes, and distinctions from other conditions is not provided here, so those details are not expanded without risking unsupported claims.
Tendinitis is categorized as a musculoskeletal condition.
This list shows research findings, not treatments. Nothing here replaces medical care. If you have this condition, talk to a doctor.
What may help
What studies found for each option, best evidence first.
2 options:1 some evidence1 not tested in people
Red Light Therapy (Photobiomodulation)practiceSome evidence it helpsSize of effect: Not known
Some human studies found a benefit. More research could change this.
All 2 studies with a clear result found a benefit.
A review of randomized trials reported pain reduction, with low certainty. Pooled animal or laboratory studies also reported changes in cytokine profiles, collagen ratio, and tensile strength in acute tendon rupture models; those results are not human findings.
Open the Red Light Therapy (Photobiomodulation) pageStrength TrainingpracticeNot tested in people
Only tested in animals, cells or theory. Results like these often do not carry over to people.
The one study found a benefit.
Progressive tendon loading, such as eccentric or heavy slow resistance, is a standard part of rehabilitation for Achilles and patellar tendinopathy and reduces pain and improves function in trials.
Open the Strength Training page
May not suit people with this condition
Supplements and practices linked to problems for people with this condition.
CalisthenicspracticeUnclear
Repetitive loading during active tendon inflammation can aggravate it, delay healing, and increase rupture risk.
Open the Calisthenics pageMobility TrainingpracticeUnclear
When tendinopathy is active and accompanied by pain and swelling, the mechanical loading from mobility exercises may worsen it.
Open the Mobility Training page
The expert view shows every study, dose protocol and source.
What may help
Interventions recorded as helping with this condition2 listedMost likely to help, from the evidence we have
- →PracticesRed Light Therapy (Photobiomodulation)CertaintyMediumSourceRCT
A review of randomized trials reported pain reduction (eSMD 0.16, 95% CI 0.07 to 0.24), with low certainty. Pooled animal or laboratory studies also reported changes in cytokine profiles, collagen ratio, and tensile strength in acute tendon rupture models; those results are not human findings.
Who was studied
- People with a condition
- Alopecia Androgenetic
- Carpal Tunnel
- Fibromyalgia
- Fracture
- Mild Cognitive Impairment
- Neck Pain
- +6 more
Open Red Light Therapy (Photobiomodulation)Study result
Low certainty for pain reduction (eSMD 0.16, 95% CI 0.07 to 0.24)
Low probability(1)
- →PracticesStrength TrainingCertaintyLowSourceTheoretical
Progressive tendon loading, such as eccentric or heavy slow resistance, is a standard part of rehabilitation for Achilles and patellar tendinopathy and reduces pain and improves function in trials.
Open Strength TrainingStudy result
Progressive tendon loading (eccentric or heavy slow resistance) is a standard component of rehabilitation for Achilles and patellar tendinopathy. It reduces pain and improves function in trials.
What to avoid
Interventions recorded as making it worse2 listedHighest probability
- →PracticesCalisthenicsCertaintyLowSourceReference knowledge
Repetitive loading during active tendon inflammation can aggravate it, delay healing, and increase rupture risk.
Open CalisthenicsRationale
Active tendon inflammation can be aggravated by repetitive loading in calisthenics, delaying healing and increasing rupture risk.
- →PracticesMobility TrainingCertaintyLowSourceReference knowledge
When tendinopathy is active and accompanied by pain and swelling, the mechanical loading from mobility exercises may worsen it.
Open Mobility TrainingRationale
Active tendinopathy with pain and swelling may worsen with mechanical loading from mobility exercises.
How to read the evidence
Evidence tier — overall strength of the evidence for the whole compound
- StrongWell established — backed by strong, consistent human research.
- ModerateSome genuine support, but mostly from small or lower-quality studies. Promising, not proven.
- PreliminaryEarly-stage evidence — a promising hypothesis, not an established effect yet.
- LimitedVery limited evidence — treat this as a hypothesis, not proof.
- InsufficientNot enough good evidence to draw conclusions yet.
Certainty — how sure we can be that the effect is real
- Very highVery sure — strong, consistent evidence
- HighFairly sure — consistent evidence from good studies
- MediumModerately sure — new studies could change this
- LowNot sure — little or mixed evidence
- Very lowVery unsure — almost no usable evidence
Source — where the data comes from
- Meta-analysisPooled analysis of many trials — the strongest evidence
- RCTRandomized controlled trial — a strong human study design
- ClinicalA human clinical study
- Reference knowledgeFrom general health-science or pharmacology references, not a study of this exact claim
- Animal researchStudied in animals, not humans
- Community reportsAggregated user reports — anecdotal signal, not evidence
- TheoreticalMechanism-based reasoning, not yet tested
Study grade — quality of each underlying study (A best, D weakest)
- AHigh-quality — strong, consistent human trials
- BGood — solid evidence with some limitations
- CModerate — limited, small, or mixed-quality studies
- DWeak — preliminary, indirect, or animal-only
Confidence — how strongly the sources back a finding
A 0–100 score from study quality and agreement
Most supplement evidence is graded C–D. Read it as preliminary signal, not proof.
Full write-up
What is it
Tendinitis is categorized as a musculoskeletal condition. A fuller description of its symptoms, causes, and distinctions from other conditions is not provided here, so those details are not expanded without risking unsupported claims.
Evidence-backed options
Collagen has been studied as an oral supplement alongside usual care for athletes with PT. The formulation under evaluation is hydrolyzed collagen combined with vitamin C, with the comparison involving usual care and placebo. The study is designed to assess changes in VISA-P score after 24 weeks, so the relevant timeframe is several months rather than an immediate effect.
This evidence does not establish how quickly any improvement might appear, because the available description identifies the study objective rather than reporting its results. It also does not provide a dose or enough information to determine whether findings apply beyond athletes with PT. The option should therefore be viewed as an area of investigation rather than a confirmed treatment for tendinitis. Anyone considering options for a medical condition should discuss them with a clinician.