How long does collagen take to work on nails?

The nail's clock, and why nothing shows before the new nail grows out

How long does collagen take to work on nails is a question the nail answers before the collagen does, because a nail is a clock that runs at a known speed, and anything that acts on a nail, a nutrient, a habit, an illness or a supplement, shows on that clock and no faster. The nail plate a reader sees is dead keratin, made at the matrix under the cuticle and pushed forward as new nail forms behind it, and a fingernail grows at around three millimetres a month, faster on the dominant hand and in summer and slower with age, so the nail at the fingertip today was made three to six months ago and the whole fingernail takes around six months to replace itself, with toenails growing at a third of the pace and taking twelve to eighteen months. That arithmetic is the whole of the timing answer: a change in the nail's strength, thickness or tendency to split from any cause at all appears only in the new nail as it grows out from the cuticle, so the earliest anything could be seen is three months, when the first centimetre of new plate has emerged, and the full effect is six months, when the old nail is gone, and no supplement is exempt from the clock because the clock is the tissue's. Before asking what collagen might do on that clock, the honest page names what most commonly does: brittle nails, the splitting, peeling, soft nails that send readers to the supplement aisle, are caused mainly by repeated wetting and drying, washing up, hand washing, swimming, solvents and nail polish remover, which swell and shrink the keratin until it delaminates, so the interventions with the largest effect are gloves for wet work, a moisturiser or oil on the nails and cuticles, and less remover, none of which is a supplement and all of which show on the same three-to-six-month clock. Nail changes that come with other symptoms, pitting, ridging, colour change, spooning, lifting from the bed, or with hair loss and fatigue, point to skin conditions, iron or thyroid and are a doctor's rather than a clock's.

The one collagen nail study, exactly described, the register's nail sentences, and the honest timetable

The one collagen nail study exists and deserves exact description, because it is the whole of the evidence a tub is quoting when it says collagen for nails. 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 measured nail growth rate and the frequency of broken nails, reporting faster growth and fewer breaks by the end and in the weeks after stopping, and the study was funded by the peptide's manufacturer. Two things make it a signal rather than a trial. It had no placebo group: every participant knew they were taking collagen for their nails, every participant had six months of attention on their nails and, presumably, their gloves and their remover, and nail growth rate and breakage are exactly the kind of measures that improve under attention alone, so the study cannot separate the collagen from the six months of caring about nails. And it was small and single, around twenty-five people and never repeated under controlled conditions, so no randomised placebo-controlled trial of collagen for nails exists and the honest verdict is that one uncontrolled study suggests and nothing has tested. The register agrees: collagen holds no authorised nail sentence, and the nail sentences belong to zinc, selenium and biotin, each of which contributes to the maintenance of normal nails, with copper holding hair pigmentation and the rest of the aisle holding nothing, so a collagen tub that mentions nails is either borrowing zinc's or biotin's sentence from the ingredient beside it or saying something the register does not permit. The honest timetable, then: if collagen does anything for nails, which one open-label study suggests and no controlled trial has shown, it would show at three to six months as the new nail grows out, the same clock as gloves and moisturiser, which have the larger effect and cost less; a reader who wants to test it takes the study's 2.5 grams for its twenty-four weeks, photographs the nails before the first dose and at three and six months in the same light, and changes nothing else about their hands, which is the control the study lacked. The worked example carries the one nail sentence honestly: two capsules, 1200mg hydrolysed type 1 marine collagen with 12mg vitamin C plus 1.5mg zinc, 120 for £16.99 at 28p a day, lab tested and UK made, the zinc contributing to the maintenance of normal nails at 15% of its reference value, the collagen near the study's 2.5 grams and stated as uncontrolled evidence, taken for vitamin C's collagen formation sentence and the habit. How long does collagen take to work on nails: three to six months if it works at all, which one uncontrolled study suggests, on a clock that gloves and a moisturiser run faster and cheaper.

What to check on the label