Tendinopathy: The Evidence-Based Supplement Protocol

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Tendinopathy — achilles, patellar, rotator cuff, tennis elbow — is best treated with progressive eccentric or heavy-slow-resistance loading. The Alfredson protocol and its modern variants remain first-line. Supplements have a small but biologically plausible role supporting collagen synthesis during the loading protocol.

Hydrolyzed Collagen Peptides + Vitamin C — Timed Pre-Exercise

The 2017 Shaw et al. trial showed that 15 g of gelatin + 50 mg vitamin C taken 30–60 minutes before jumping exercise doubled collagen synthesis markers compared to placebo. The mechanism: peak plasma glycine and proline at the time of exercise, when tendon collagen turnover is upregulated. Practical protocol: 15 g hydrolyzed collagen + 200 mg vitamin C 30–60 minutes before loading sessions. See our collagen + tendon piece.

EPA-Dominant Omega-3, 2 g Daily

Omega-3 modestly reduces inflammatory markers in chronic tendinopathy. Effect smaller than loading protocols but additive.

Vitamin D — Repletion in Deficiency

Vitamin D deficiency is associated with worse tendon healing in animal models and observational cohorts. Repletion supports the loading protocol. See vitamin D piece.

Curcumin (Bioavailable Form), 500 mg Daily

Curcumin's anti-inflammatory effects may benefit chronic tendinopathy. Trial data is sparse but mechanistically plausible. Use bioavailable form. See curcumin piece.

Magnesium — Adequacy

Adequate magnesium intake supports muscle function adjacent to the tendinopathy. Not a tendon-specific intervention.

What NOT to Take

Avoid NSAIDs long-term — they may impair tendon healing despite reducing acute pain. Avoid corticosteroid injections except as bridge therapy — they accelerate degeneration. Skip "tendon support" megaformulas without trial backing. Don't replace eccentric loading with supplements alone — the loading protocol is the dominant intervention.

How to Run the Protocol

Progressive eccentric or heavy-slow-resistance loading 12+ weeks under physical therapy guidance. Take 15 g hydrolyzed collagen + 200 mg vitamin C 30–60 minutes before loading sessions. Add omega-3 2 g daily ongoing. Replete vitamin D. Re-evaluate at 12 weeks; tendon healing is slow. If unresolved, sports medicine consult for PRP, shockwave therapy, or surgical options. See condition page.