Nutrition

Eating for Tendon Healing and Upkeep

What you eat during Achilles recovery affects the rate and quality of tendon repair. The evidence base here is genuinely useful — specific nutrients, specific timing, specific amounts. This section covers both the acute healing phase and the long-term dietary habits that keep tendons resilient.

Tendons heal slowly

Tendon tissue has poor vascularity and slow collagen turnover compared to muscle. Nutritional support during recovery needs to be sustained over months, not days. There are no shortcuts — but there are meaningful advantages to getting it right.

Collagen synthesis is targetable

The collagen that rebuilds the tendon requires specific precursors — particularly glycine, proline, and vitamin C. These can be provided through diet and supplementation at clinically meaningful doses. Timing relative to rehabilitation exercise matters.

Inflammation is a double-edged sword

Acute inflammation after injury is necessary for healing. Chronic, low-grade inflammation impairs it. The dietary goal is to support the acute phase without driving the chronic state — not to eliminate inflammation entirely.

Nutrition doesn't replace rehabilitation — but it can meaningfully support it. The research on tendon nutrition has developed significantly over the past decade, particularly around collagen peptide supplementation and vitamin C timing. The evidence is not yet at the level of certainty that allows definitive clinical guidelines, but it is strong enough to make specific, evidence-informed recommendations.

This section is organised into two parts: nutrition for acute healing — what to prioritise in the weeks and months after rupture — and nutrition for tendon upkeep — the long-term dietary patterns that maintain tendon health and reduce re-injury risk once you have recovered.

Quick reference — key nutrients for tendon healing

Evidence-based priorities. Always read the full guide before purchasing supplements.

Strong evidence

→Hydrolysed collagen peptides — 15g, 60 min before exercise

→Vitamin C — 50mg taken with collagen supplement

→Adequate total protein — 1.6–2.0g per kg bodyweight per day

Plausible, emerging evidence

→Omega-3 fatty acids — 2–3g EPA+DHA daily

→Curcumin — anti-inflammatory, poor bioavailability without piperine

→Magnesium — important for muscle function, deficiency common

→Bromelain — early post-injury swelling management

Insufficient evidence

→Glucosamine/chondroitin — evidence for joints, not tendons

→MSM — limited quality evidence for tendon specifically

→Most "tendon repair" blended supplements — proprietary blends with inadequate doses

What to Limit During Recovery

Excessive alcohol

Impairs collagen synthesis, disrupts sleep quality, and increases systemic inflammation. All three matter during tendon healing.

Ultra-processed foods

High in pro-inflammatory omega-6 fatty acids, refined sugars, and seed oils. Drive chronic low-grade inflammation that impairs healing.

NSAIDs long-term

Anti-inflammatory medications may suppress the acute inflammatory response needed for healing. Short-term use is different from prolonged use — discuss with your doctor.

Crash dieting

Severe caloric restriction during recovery impairs tissue repair and increases muscle loss during immobilisation. Not the time to aggressively cut weight.

High sugar intake

Elevated blood glucose impairs collagen cross-linking through glycation. Particularly relevant for people with diabetes or insulin resistance.

Fluoroquinolone antibiotics

If prescribed antibiotics during recovery, flag any fluoroquinolone prescription (ciprofloxacin etc.) to your doctor — these carry an FDA black box warning for tendon rupture risk.