Does collagen help healing after surgery?

The surgeon's perioperative nutrition checklist, line by line

Does collagen help healing after surgery is a question that patients ask in the weeks before and after an operation, and the honest page answers it by reading the checklist that surgeons and dietitians actually use, the perioperative nutrition guidance built into enhanced recovery programmes and surgical nutrition guidelines, because that checklist is what the evidence says helps healing after surgery and the question of collagen is the question of where it sits on it. The first line is protein, and it is the line that matters most: healing is protein synthesis, new matrix, new vessels, new skin and the immune cells that guard the wound are all built from amino acids, and surgery raises the body's protein demand while often lowering its intake through poor appetite and fasting, so the guidance asks for around 1.2 to 2.0g of protein per kilogram of body weight a day in the weeks around an operation, higher than a sedentary adult's usual intake and spread across meals, from complete sources that supply all nine essential amino acids. The second line is energy: a body short of calories burns its protein for fuel instead of building with it, so adequate energy intake protects the protein line, and a patient who eats little after surgery heals slowly for that reason among others. The third line is screening and correction before elective surgery: malnutrition, which a share of surgical patients have and which predicts complications, anaemia, which impairs oxygen delivery to the wound and is corrected with iron or otherwise before the operation where possible, and vitamin D deficiency, common and associated with poorer outcomes, each identified by a blood test and corrected in the weeks before. The fourth line is smoking, stopped as many weeks before surgery as possible, since smoking impairs blood flow and oxygen delivery to tissue and roughly doubles wound complications in many series, the single largest modifiable risk a patient controls. The fifth is blood glucose, controlled before and after, since raised glucose impairs immune function and healing and is why diabetic patients' surgery is planned around their control. The sixth is early feeding and early mobilisation after the operation, eating within hours where the surgery allows and getting up and moving on the first day, both of which enhanced recovery programmes have shown to shorten stay and reduce complications. Beyond the checklist's core, immunonutrition formulas containing arginine, omega-3 fatty acids and nucleotides have been studied in major abdominal and cancer surgery with mixed results, positive in some trials for infection and stay and neutral in others, and are used selectively. That is the checklist, and every line on it has outcome evidence in surgical patients; the honest page now asks where collagen sits.

Where collagen sits on the checklist, what has never been tested, and the honest position for a patient

Collagen sits on the checklist in exactly one place, the protein line, and it sits there as incomplete protein, which changes what it contributes. Hydrolysed collagen is protein by nitrogen and appears on its nutrition panel as such, but it contains no tryptophan, one of the nine essential amino acids, and roughly a third of whey's leucine, the amino acid that triggers muscle and tissue protein synthesis, so that it scores at or near zero on the PDCAAS and DIAAS protein quality scales and cannot by itself sustain the protein synthesis that healing is; a patient who reaches 1.5g per kilogram with 30g of collagen counted in has reached it on paper and fallen short of it in the body, and may have displaced the eggs, dairy, meat, fish, soya or whey that would have met the line. Collagen's amino acids, glycine, proline and hydroxyproline, are the ones connective tissue is built from and are supplied in abundance by complete protein at the checklist's intake, so the one argument for collagen on the protein line, that it supplies wound matrix amino acids, holds only for a patient short of protein overall, which is the protein-short situation the pressure ulcer trials addressed. Those trials are the whole of collagen's healing evidence: small randomised studies in long-term care residents with pressure ulcers, many under-nourished, in which collagen or a collagen-containing protein supplement beside standard wound care improved healing scores over eight weeks, read by the authors as protein repletion in a deficient population. No trial has given collagen peptides to fed adults after surgery and measured wound healing, infection, length of stay, return to function or any recovery outcome, so collagen's effect on healing after surgery in a fed patient is untested, and the checklist's lines, each with outcome evidence, are what the evidence says to do. The honest position for a patient follows. Meet the protein line with complete protein, around 1.2 to 2.0g per kilogram from food and, where appetite is poor, a whey or mixed protein supplement that a dietitian may recommend, and count collagen for nothing towards it. Meet the rest of the checklist, which outranks any supplement: energy, the pre-operative blood tests and their corrections, smoking stopped, glucose controlled, early feeding and movement. Then, if a patient wants collagen beside all that for its own reasons, take it as a top-up and not as the protein, and run it, like every supplement, past the surgical team, who may ask that all supplements stop in the days around the operation for reasons of their own. The worked example is a habit for after the checklist is met, stated on its true terms: two capsules, 1200mg hydrolysed type 1 marine collagen with 12mg vitamin C at 15% of its reference value plus zinc, 120 for £16.99 at 28p a day, lab tested and UK made, counting for nothing towards the protein line, below the 2.5 to 15g research band, carrying vitamin C's collagen formation sentence and zinc's protein synthesis sentence, and holding no healing claim. Does collagen help healing after surgery: as far as it helps a protein-short patient towards a line that complete protein reaches better, and nowhere else on the surgeon's list.

What to check on the label