Several supplements have meaningful evidence behind them for tendonitis, with hydrolyzed collagen combined with vitamin C sitting at the top of the list. Tendons are roughly 65 to 80 percent collagen by dry weight, and giving your body the raw materials for collagen production, along with nutrients that reduce inflammation, can support the healing process. No supplement replaces progressive loading exercises, which remain the cornerstone of tendonitis recovery, but the right nutritional support can make a real difference in how quickly and effectively your tendons repair.
Collagen Peptides: The Strongest Evidence
Hydrolyzed collagen (also sold as collagen peptides) provides the specific amino acids your tendons need to rebuild: glycine, proline, and hydroxyproline. These three amino acids form the triple-helix structure that gives tendons their strength. Because tendons are primarily made of type I collagen, supplementing with collagen-derived peptides delivers a concentrated dose of the exact building blocks your body uses during repair.
The most-studied dose is 15 grams per day, which has been shown to increase collagen synthesis and keep it elevated for up to 72 hours. A 5-gram dose also raises amino acid levels in the blood, but the 15-gram dose produces significantly more raw material for tissue repair. Timing matters: blood levels of the key amino acids peak about one hour after taking 15 grams, so consuming your collagen roughly 60 minutes before any rehabilitative exercise gives your tendons the best window to use those building blocks while they’re mechanically stimulated.
Gelatin works through the same mechanism. It’s essentially a less processed form of collagen and provides the same amino acid profile. Some people mix gelatin powder into juice or food as a cheaper alternative to collagen peptide supplements.
Vitamin C: Essential, Not Optional
Vitamin C isn’t just a nice add-on to collagen. It’s a required cofactor. Your body uses vitamin C to convert proline and lysine (two amino acids in collagen) into hydroxyproline and hydroxylysine. Without that conversion, collagen molecules can’t form their proper structure, and your tendons can’t rebuild effectively. Vitamin C also promotes the cross-linking that gives finished collagen its tensile strength.
On the flip side, even a mild vitamin C deficiency slows procollagen synthesis and reduces the hydroxylation process, directly hindering tendon repair. Most clinical trials studying collagen supplementation for tendons include vitamin C as part of the protocol, typically in doses between 50 and 500 milligrams taken alongside the collagen. Since vitamin C is water-soluble and inexpensive, there’s little reason not to pair it with any collagen supplement you’re taking.
Omega-3 Fatty Acids for Inflammation
Tendonitis involves chronic, low-grade inflammation that damages the tendon’s structural matrix over time. Omega-3 fatty acids, specifically EPA and DHA from fish oil, target two key inflammatory signals that are elevated in damaged tendons. In animal studies of Achilles tendonitis, omega-3 supplementation significantly reduced levels of both of these inflammatory markers, and the effect was even stronger when combined with exercise.
The combination of omega-3s plus exercise outperformed either intervention alone, which aligns with a broader pattern in tendon research: supplements tend to work best when paired with progressive loading. Most general dosing recommendations for anti-inflammatory benefits fall in the range of 2 to 3 grams of combined EPA and DHA daily. If you’re already taking blood thinners or anticoagulant medications, omega-3s can increase bleeding risk, so that combination needs medical oversight.
Curcumin: Pain and Soreness Relief
Curcumin, the active compound in turmeric, has strong anti-inflammatory properties and a growing evidence base for musculoskeletal pain. A meta-analysis covering 12 studies found that curcumin supplementation effectively reduces muscle soreness, with the best results coming from lower doses (under 500 milligrams per day) started about one week before the period of high activity or strain.
Interestingly, higher doses didn’t perform better. The subgroup taking less than 500 milligrams daily showed the most consistent pain relief, while doses above 1.5 grams had no statistically significant benefit over placebo. Standard turmeric powder is poorly absorbed on its own, so look for formulations designed for better bioavailability, often labeled as containing piperine, phytosomes, or nano-curcumin. Like omega-3s, curcumin can thin the blood, so combining it with anticoagulants raises the same concern.
Leucine and Protein for Tendon Growth
Tendons respond to mechanical loading by thickening and strengthening, but they need adequate protein to do so. The amino acid leucine appears to play a specific stimulatory role in collagen synthesis. One study in healthy young men found that whey protein supplementation providing about 2.8 grams of leucine on training days, combined with resistance exercise, produced measurably greater tendon thickening than exercise alone.
This doesn’t mean you need a separate leucine supplement. A serving of whey protein or a meal rich in dairy, eggs, or meat provides enough leucine to hit that threshold. The takeaway is that overall protein intake matters for tendon recovery, and if you’re under-eating protein while dealing with tendonitis, your tendons are likely healing more slowly than they could be.
Bromelain for Early-Stage Swelling
Bromelain is an enzyme derived from pineapple stems that has been studied for reducing pain and swelling after acute soft tissue injuries. In an animal model of acute Achilles tendon injury, bromelain given at a dose of 600 GDU (gelatin digesting units) once daily for 14 days promoted healing by stimulating the proliferation of tenocytes, the cells responsible for building and maintaining tendon tissue. The dosage used was 7 milligrams per kilogram of body weight per day.
This evidence is still early-stage, and most of it comes from animal research rather than large human trials. Bromelain is most likely to be useful in the acute phase of a tendon injury, when swelling and inflammation are at their peak, rather than in long-standing chronic tendonitis.
Trace Minerals: Copper and Manganese
Copper plays a direct role in tendon integrity through its effect on an enzyme called lysyl oxidase, which creates the cross-links between collagen fibers that give tendons their mechanical strength. Research has shown a strong linear relationship between dietary copper levels and lysyl oxidase activity in tendon tissue. When copper is deficient, the cross-linking amino acids in collagen decrease, weakening the overall structure.
Manganese supports similar enzymatic processes. Neither mineral needs to be supplemented in high doses. A standard multivitamin or a diet that includes nuts, seeds, shellfish, and whole grains typically provides enough. The concern isn’t about mega-dosing these minerals but about making sure you’re not deficient, especially during a recovery period when collagen turnover is high.
What Probably Won’t Help Much
Glucosamine and chondroitin are popular joint supplements, but their primary targets are cartilage components, not tendon. Glucosamine has been shown to increase type II collagen and aggrecan, both of which are cartilage-specific. Tendons are made of type I collagen, so the mechanism doesn’t transfer well. If you have joint pain alongside your tendonitis, there may be some benefit, but for the tendon itself, the evidence is thin.
MSM (methylsulfonylmethane) shows clinically noticeable but statistically insignificant reductions in muscle and joint pain. In a trial involving half-marathon runners, the MSM group had meaningfully lower pain scores (differences greater than 10 millimeters on a pain scale) at multiple time points, but the study couldn’t confirm the effect wasn’t due to chance. MSM isn’t harmful, but the evidence is too weak to make it a priority over the supplements listed above.
Putting a Stack Together
If you’re choosing supplements specifically for tendonitis recovery, the combination with the most evidence behind it is 15 grams of hydrolyzed collagen taken with vitamin C about an hour before your rehabilitation exercises. Adding 2 to 3 grams of omega-3s daily addresses the inflammatory side, and curcumin at under 500 milligrams per day can help manage pain. Making sure your overall protein intake is adequate and your diet includes trace minerals like copper rounds out the approach.
Multi-nutrient strategies tend to outperform single-supplement approaches for tendon health, which makes sense given how many different nutrients are involved in collagen metabolism. Tendons heal slowly regardless, with timelines measured in weeks to months rather than days. Supplements won’t shortcut that biology, but they can ensure your body has everything it needs to make the most of the repair process that’s already underway.