Supplements After Shoulder Surgery: What the Science Actually Says

Every week, a patient asks me about supplements. Collagen, creatine, BPC-157, protein shakes. Here's the evidence-based answer organized by what actually works, what's promising, and what's hype.

As a shoulder and elbow surgeon, I spend a lot of time thinking about what happens to tissue after surgery. My job in the operating room is to repair what's torn or damaged. But what happens over the next six to twelve months while that tissue heals, remodels, and regains its strength is largely determined by factors outside of that trip to the OR. Nutrition is one of them.

The supplement industry has not been subtle about this. Walk into any health food store or scroll through social media for five minutes and you will find no shortage of products claiming to "support joint health," "accelerate healing," and "optimize recovery." While some of these claims are grounded in clinical evidence, many are not. Knowing the difference matters.

What follows is my attempt to give you an organized framework that is built on the peer-reviewed literature.

What Your Body Is Actually Doing After Shoulder Surgery

Before discussing specific supplements, it helps to understand what you are trying to support biologically.

After rotator cuff repair or other shoulder surgery, your body is engaged in a complex, staged repair process. In the first days to weeks, inflammatory signals recruit cells to the repair site and begin laying down provisional scaffolding. Over the following months, collagen is synthesized and organized, the tendon-to-bone interface remodels, and the surrounding muscles try to recover from the atrophy that resulted from all the downtime.

This process has two distinct biological targets: the repair itself (tendon, collagen, the bone-tendon interface) and the muscle surrounding it (which is losing mass at a measurable rate from the moment your arm goes into a sling).

The supplements we'll be discussing address one or both of these targets.

What the Evidence Supports

1. Protein

This is hands-down the most important supplement on this list. Your body cannot rebuild muscle or synthesize new tendon collagen without adequate protein. It is the raw material for both.

The research is clear on dosing. After orthopedic surgery, you should be targeting 1.2 to 1.6 grams of protein per kilogram of body weight, every day. For most people, this means meaningfully increasing their daily intake — not just adding a protein shake, but auditing the whole diet. Lean meats, fish, eggs, Greek yogurt, legumes, and cottage cheese are all excellent sources.

Protein is not glamorous and it will likely not appear in a sponsored Instagram post, but it is more important to your recovery than any other supplement on this list. In my practice, protein deficiency is all too common among post-operative patients.

Timing for consumption matters as well. To optimize muscle protein synthesis throughout the day, protein intake should be distributed across meals rather than concentrating it in one or two large servings. One should aim for roughly 30–40 grams per meal across three to four meals rather than a single high-protein dinner.

2. Vitamin D

I measure Vitamin D levels in my surgical patients preoperatively because the consequences of deficiency in the post-operative period are well-documented.

Multiple studies have linked vitamin D deficiency to worse outcomes after rotator cuff repair, including higher re-tear rates and slower functional recovery. The mechanism is direct: vitamin D plays a documented role in collagen formation, calcium absorption, muscle function, and the modulation of the inflammatory response during tendon healing.

A reasonable estimate is that roughly one in three Americans is vitamin D deficient. Fortunately, while it is prevalent, it can also be corrected, and in the context of shoulder surgery, correcting it before and after your procedure is probably one of the highest-yield interventions available.

The standard repletion dose in deficient patients is 2,000–5,000 IU daily, depending on baseline levels, but this is something to confirm with your physician. The key action item is to get your level checked. A simple blood test tells you whether this applies to you.

3. Collagen with Vitamin C

Your rotator cuff is built primarily from type I collagen. After surgery, your body is attempting to synthesize new collagen at the repair site. To complete that synthesis, your body depends on two enzymes named prolyl hydroxylase and lysyl hydroxylase that are entirely vitamin C dependent. Without adequate vitamin C, the collagen molecule cannot be properly cross-linked and stabilized.

The clinical evidence comes primarily from a randomized crossover study in which participants received either a placebo, 5 grams, or 15 grams of gelatin (a food-derived form of collagen) combined with vitamin C, one hour before exercise. The 15-gram group showed more than double the collagen synthesis compared to placebo, measured via validated blood markers, and that effect was sustained for 72 hours.

The practical application: consider taking 15 grams of hydrolyzed collagen with vitamin C approximately one hour before your physical therapy sessions. The evidence suggests that mechanical loading (e.g. physical therapy) directs the circulating collagen precursors toward the repair site. The supplement and the PT work together.

One thing to note: The study above was conducted in healthy young men, and we do not yet have large randomized trials measuring re-tear rates or functional outcomes as a direct function of collagen supplementation in rotator cuff repair patients. So while the early evidence is compelling, the clinical benefit for the post-operative patient has not yet been established.

4. Essential Amino Acids (EAAs)

This is almost certainly the most under-appreciated category on this list, and it addresses a problem that is distinct from the previous three: muscle loss during immobilization.

When your arm goes into a sling after rotator cuff repair, your shoulder muscles begin atrophying almost immediately. Research shows that immobilization can drive muscle loss at a rate of up to nearly 1% per day. Within four weeks in a sling, you can lose a meaningful fraction of the muscle mass around your shoulder — and that muscle is what ultimately powers your recovery once the sling comes off.

Essential amino acids are the nine amino acids your body cannot synthesize on its own. They are the building blocks of muscle protein. This is the critical distinction between EAAs and BCAAs (branched-chain amino acids), which you have probably seen marketed heavily. BCAAs provide only three of the nine essential amino acids: enough to trigger the muscle-building signal, but not enough to complete the process. EAAs, by providing all nine essential amino acids, give your body both the signal and the substrate it needs.

The clinical evidence comes from two landmark randomized controlled trials in TKA patients. Dreyer et al. demonstrated in a double-blind, placebo-controlled RCT that 20 grams of EAAs twice daily, starting one week before surgery and continuing for six weeks after, meaningfully reduced quadriceps and hamstring muscle atrophy on MRI compared to placebo. Ueyama et al. extended this finding in a follow-up double-blinded RCT showing that perioperative EAA supplementation facilitated greater quadriceps muscle volume and strength recovery up to two years after surgery compared to controls — a difference that persisted long after supplementation ended.

We do not yet have equivalent large-scale trials specifically in shoulder surgery patients, but the physiological mechanisms are directly applicable. If I am a patient about to spend four to six weeks in a sling, EAAs are the supplement I am most actively thinking about to mitigate the muscle loss I know is coming.

Typical research protocols have used 9 to 20 grams per day. This is a conversation worth having with your surgeon before your procedure.

What Doesn't Have the Evidence

BPC-157

This synthetic peptide has become one of the most common supplements my patients ask me about, and I can appreciate why. The supplement purportedly accelerates tissue healing, reduces inflammation, and promotes tendon repair, which is exactly what post-surgical patients are hoping for.

A 2025 systematic review in the HSS Journal — the first to examine BPC-157 specifically from an orthopedic sports medicine perspective — identified 36 studies published between 1993 and 2024. Of those, 35 were preclinical animal studies. Only one human study existed, and it examined knee pain, not surgical tendon healing. The review found no clinical safety data in humans. BPC-157 is not approved by the FDA for human use and is banned by WADA in competitive sport.

The hype surrounding BPC-157 is significantly ahead of the science. While I get the appeal, I think patients deserve to know what they are actually putting into their bodies. Right now, we do not have the human data to responsibly recommend it.

The Practical Framework

If I could give every post-operative shoulder patient one piece of guidance about supplementation, it would be this: nail the basics before you spend money on anything else.

The four categories with the strongest evidence are:

Protein — 1.2 to 1.6 g/kg/day, distributed across meals. Non-negotiable.

Vitamin D — get your level checked. Correct deficiency before and after surgery.

Collagen with Vitamin C — 15 grams of hydrolyzed collagen with vitamin C, one hour before physical therapy.

EAAs — 9 to 20 grams daily, particularly if you are facing a prolonged sling period, are older, or are already lean.

A Final Note on Individualization

No supplement protocol is one-size-fits-all. Your age, baseline nutritional status, the specific surgery you had, and your rehabilitation timeline all affect what is most relevant for you. The framework above reflects the best available evidence as I understand it, but this is a starting point for a conversation with your surgeon, not a prescription.

If you are preparing for shoulder surgery or are currently in recovery and want to talk through what makes sense for your specific situation, that is exactly the kind of conversation I welcome in clinic.

The content in this post is for educational purposes only. It does not constitute medical advice and is not a substitute for evaluation and guidance from your treating physician.

References

1. Shaw G, Lee-Barthel A, Ross ML, Wang B, Baar K. Vitamin C–enriched gelatin supplementation before intermittent activity augments collagen synthesis. Am J Clin Nutr. 2017;105(1):136–143. PMID: 27852613.

2. Angeline ME, Ma R, Pascual-Garrido C, Voigt C, Deng XH, Warren RF, Rodeo SA. Effect of diet-induced vitamin D deficiency on rotator cuff healing in a rat model. Am J Sports Med. 2014;42(1):27–34. PMID: 24131579.

3. Kjaer M. Role of extracellular matrix in adaptation of tendon and skeletal muscle to mechanical loading. Physiol Rev. 2004;84(2):649–698. PMID: 15044685.

4. Dreyer HC, Owen EC, Strycker LA, et al. Essential amino acid supplementation mitigates muscle atrophy after total knee arthroplasty: a randomized, double-blind, placebo-controlled trial. JBJS Open Access. 2018;3:e0006.

5. Ueyama H, Kanemoto N, Minoda Y, Taniguchi Y, Nakamura H. Perioperative essential amino acid supplementation facilitates quadriceps muscle strength and volume recovery after TKA: a double-blinded randomized controlled trial. J Bone Joint Surg Am. 2023;105:345–353.

6. Brown E, Mohler SA, Kviatkovsky SA, et al. Amino acid supplementation may help prevent muscle wasting after orthopedic surgery, but additional studies are warranted: a systematic review of randomized clinical trials. Orthop J Sports Med. 2025. PMID: 39749765.

7. Fukushima R, Saito H, Yamamoto T, et al. Efficacy of protein and essential amino acid supplementation in lower limb surgeries: a systematic review and meta-analysis. J Orthop Res. 2023. PMC: 11469702.

8. Jazayeri R, Anil U, Zuckerman JD. The role of amino acid supplementation in orthopaedic surgery. J Am Acad Orthop Surg. 2023. DOI: 10.5435/JAAOS-D-23-00300.

9. Vasireddi N, Hahamyan H, Salata MJ, et al. Emerging use of BPC-157 in orthopaedic sports medicine: a systematic review. HSS J. 2025. PMID: 40756949.