What are the 5 signs that collagen is working?

Five as a format, and the two signs on the list that a trial actually measured

What are the five signs that collagen is working is a question shaped by the listicle that answers it everywhere else, and the honest page audits the shape before the signs, because five is a format and not a finding, chosen because readers click on odd numbers and not because the evidence produced five of anything, so the useful question is which of the five any collagen trial ever measured. The listicles' five are consistent: glowing skin, stronger nails, thicker hair, easier joints and a better gut, in some order, and the audit takes them in order of evidence rather than popularity. Skin was measured, and it is the best-evidenced sign on the list: the oral collagen skin trials gave 2.5 to 10 grams a day for eight to twelve weeks and measured skin elasticity by cutometer suction and hydration by corneometer capacitance, with dermal density by ultrasound and eye wrinkle depth by profilometry in some, and found gains of a few percent against placebo in trials that were small, mostly funded by the peptide's manufacturer and read by devices, so skin is a real sign with a real timetable and a real instrument, and the listicle's word glowing is the one part of it no trial measured, since a few percent on a cutometer is below what a mirror shows and glow is a word for the surface layer's hydration, which the glass of water moves in a day. Joints were measured, the second real sign: the joint comfort trials gave around ten grams a day for twelve to twenty-four weeks and measured activity-related pain and composite pain, stiffness and function scores by questionnaire, finding modest improvements against placebo at twelve weeks and clearer ones at twenty-four, in small, mostly industry-funded trials, with no change in cartilage on any imaging, so joints are a real sign with a timetable and an instrument, the instrument being a scored sheet that a reader keeps weekly on one provoking movement and that memory cannot replace. Two signs measured, both at eight to twenty-four weeks at trial doses, both by instruments a reader does not own or must make, and both well short of the listicle's adjectives.

The three signs that were measured once, or never, and the honest list of two

Nails were measured once, without a placebo. An open-label study gave 2.5 grams a day of specific collagen peptides for twenty-four weeks to around twenty-five people with brittle nails and reported faster nail growth and fewer broken nails, funded by the manufacturer, with every participant knowing what they took and six months of attention paid to nails that had been neglected, and no control group to separate the collagen from the attention, so nails are a signal from one uncontrolled study and not a sign a trial has confirmed, and the nail's own clock, three millimetres a month and six months to replace a fingernail, puts any change at three to six months in any case. Hair was never measured: no collagen trial has had hair density, shedding, thickness or growth rate as an outcome, the listicle's thicker hair being an extrapolation from the skin trials and from the fact that hair grows out of skin, and hair being keratin, a protein rich in the cysteine that collagen almost entirely lacks, so the sign has neither a trial nor a mechanism, and the hair cycle's three to six months would hide any change that did exist from a reader judging at week four. Gut was never measured: the better gut on the list comes from the bone broth and gelatin for leaky gut story, which rests on animal and cell models in which gelatin and glycine improve gut barrier markers, with human evidence thin and condition-specific, no trial in healthy adults, no gut claim for collagen or gelatin in the register, and no mechanism by which a protein with no fibre would change a bowel, so the fifth sign is a sign of the listicle needing a fifth. The honest list, then, has two entries: skin, by instrument at eight to twelve weeks at 2.5 to 10 grams, and joints, by scored sheet at twelve to twenty-four weeks at around ten grams, both modest and both from small industry-funded trials; nails are a maybe from one uncontrolled study, and hair and gut are the format talking. The register's view of the five matches the audit: collagen holds no claim for skin, nails, hair, joints or gut, and the sentences on a collagen tub for skin, hair and nails belong to vitamin C, zinc and biotin beside it, with no gut sentence available to anyone on the shelf. The worked example promises none of the five and carries the register's lines honestly: two capsules, 1200mg hydrolysed type 1 marine collagen with 12mg vitamin C plus zinc, 120 for £16.99 at 28p a day, lab tested and UK made, below the trial doses, taken for vitamin C's collagen formation sentence for skin and zinc's maintenance of normal skin, hair and nails, the only sentences on the list anyone may print. What are the five signs that collagen is working: two were measured, one once without a placebo, two never, and the number five was chosen before the evidence was consulted.

What to check on the label