Collagen Before or After Workout? The Timing Evidence

Evidence Guide · 5 min read

Collagen Timing: Why Pre-Workout Wins

Unlike most supplements where timing is relatively flexible, collagen peptides have specific timing requirements that significantly affect their effectiveness. A 2017 study by Keith Baar at UC Davis changed how collagen supplementation should be approached for connective tissue health.

The 2017 Baar Study: Why Pre-Workout Timing Matters

Baar’s study found that consuming collagen peptides + vitamin C (50mg) 1 hour before exercise doubled functional collagen synthesis in ligaments compared to placebo. The mechanism: exercise increases blood flow to tendons and ligaments. Collagen peptides elevate circulating glycine and proline (collagen-specific amino acids) in blood. When exercise drives blood flow to connective tissue, these amino acids are delivered to the sites of collagen synthesis. Timing collagen to coincide with the increased post-meal amino acid availability AND the increased connective tissue blood flow from exercise is the key.

The Role of Vitamin C

Vitamin C is not optional when taking collagen for connective tissue — it’s required. Vitamin C (ascorbic acid) is a cofactor for prolyl hydroxylase and lysyl hydroxylase — the enzymes that cross-link collagen chains into stable triple helix structures. Without vitamin C, collagen chains cannot form proper structure regardless of how much collagen protein you consume. Take 50mg of vitamin C with your collagen dose — this is sufficient. More is not better for this specific purpose.

Pre-Workout Protocol

Optimal collagen timing: 15g collagen peptides + 50mg vitamin C, 30–60 minutes before exercise. This allows time for digestion and peak plasma amino acid availability to coincide with the exercise-induced blood flow to tendons and ligaments.

Types of exercise this applies to: any training that loads tendons and ligaments — resistance training, running, jumping rope, cycling. The connective tissue blood flow increase is highest during the initial 10–15 minutes of exercise.

Collagen for Skin vs Joints: Different Goals, Same Timing

For joint and tendon health: pre-workout timing is clearly optimal (Baar protocol). For skin collagen synthesis: timing is more flexible — taking collagen at any consistent time with vitamin C supports skin collagen turnover. Studies on skin benefits typically don’t require specific pre-workout timing because skin doesn’t have the same exercise-driven blood flow dynamic as tendons. A morning collagen dose with breakfast + vitamin C works well for skin goals.

Can You Take Collagen Post-Workout?

Yes, post-workout collagen still provides amino acids for collagen synthesis and some recovery benefit. But the Baar study evidence shows that pre-workout timing, which exploits the blood flow window, is meaningfully superior for connective tissue repair and injury prevention. If pre-workout timing is inconvenient, post-workout is still better than not taking collagen at all — just less optimal.

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