Collagen and glycine.
Start with the question.

Compare the ingredients

Similar names and shared amino acids can obscure different materials, amounts and research questions.

• Ingredient comparison

  Glycine vs magnesium glycinate

  Free glycine is an amino acid. Magnesium glycinate is a magnesium compound that includes glycine. Their label amounts describe different things, and their sleep studies do not establish that one is a substitute for the other.

• Ingredient comparison

  Collagen vs free glycine

  Collagen peptides contain a mixture of linked amino acids, including glycine. Free glycine supplies that individual amino acid. A gram of collagen is not a gram of free glycine, and research on one does not establish the same benefit from the other.

• Ingredient comparison

  Does GlyNAC research apply to glycine alone?

  GlyNAC combines glycine with N-acetylcysteine (NAC). Results from that combination cannot be assigned to glycine alone. The 2023 Kumar trial did not include a glycine-only arm.

• Ingredient comparison

  Collagen peptides versus bone-broth protein: compare the declared amounts

  Collagen ingredient weight, total protein and scoop weight answer different questions. These two exact unflavored products illustrate the distinction; they do not represent every collagen or bone-broth product.

Collagen research

Read skin findings alongside study quality, funding and the exact material tested.

• Study methods

  What amounts and durations did selected collagen skin studies test?

  A research amount belongs to a particular material, population and study design. These selected examples describe different interventions; they do not establish a recommended serving, a dose ranking or results from Dayspan Collagen Essentials.

• Ingredient evidence

  What the collagen skin reviews found

  The ingredient record links the reviews and explains why positive findings need qualification.

• Dayspan product context

  Collagen Essentials: the working formula

  Check the named ingredients, working amounts and material specifications against the research.

Glycine and Nightspan research

Keep glycine studies, mineral amounts and evidence for a combination separate.

• Research ledger

  Nightspan ingredient research ledger

  Source links, study designs, funding, findings and limitations, including historical exclusions.

• Ingredient evidence

  Glycine: amount, rationale and limitations

  Read the ingredient record beside the other actives in the working Nightspan formula.

• Dayspan product context

  Nightspan: the working formula

  See free glycine and the four other actives with their separate amounts and roles.

Read the evidence in context

A formulation decision, a study result and a finished-product claim answer different questions.

• Editorial standard

  The Dayspan evidence standard

  How material, amount, population and outcome affect what a study can support.

• Label-reading guide

  How to read collagen and glycine supplement labels

  Start with serving size, then compare the named ingredient, its amount and its form. Scoop weight, blend weight and an individual ingredient amount answer different questions.

• Batch-report reading guide

  How to read a collagen batch report

  Connect the report to a product and lot, read methods and results, and distinguish detection limits from acceptance criteria.

• Ingredient library

  Inside the Formula

  All current public ingredient records, with their working amounts, original sources and limitations.

Download the label comparison data

Download the selected ingredient and format rows for Nightspan versus NativePath Native Sleep and Collagen Essentials versus Elysium Cofactor. Each record retains the displayed wording, units, source links and whether it describes a Dayspan working formula or a dated competitor label.

The files use the same records as our public comparison tables. The competitor snapshot date identifies the original source check; it is not a new review or final Dayspan label approval. Ranges and unknown amounts stay explicit. Prices, directions and testing claims are excluded.

This is a selected comparison, not a complete label transcription or market survey. Ingredient quantities do not show which product works better. Consult the complete current labels for other ingredients, allergens and directions; final Dayspan specifications and serving details remain pending.

JSON includes the methods and a content revision. CSV has one row per field and product, with lists stored as JSON inside cells. An empty source-check date denotes an undated working Dayspan record.