Invigor8 Collagen Peptides
A hydrolysed collagen peptide powder covering types I, II and III with added vitamin C, from $34.95. The vitamin C inclusion is technically well judged, since it is required for collagen synthesis. The claims range wider than the evidence: promoting lean muscle mass and supporting cardiovascular performance to support weight loss both go beyond what collagen has been shown to do.
Last reviewed · researched from the manufacturer’s published pages by Tom
What’s in it
Amounts are shown only where the manufacturer publishes them. Anything without a figure is undisclosed — and for an active ingredient, an undisclosed dose is the central problem with this category.
- Hydrolysed collagen peptides, types I, II and IIIamount not published
Amount per serving not published on the page we captured
- Vitamin Camount not published
Required cofactor for collagen synthesis; amount not published
How the manufacturer says it works
Invigor8 describes it as hydrolysed collagen peptides types I, II and III with vitamin C, helping promote lean muscle mass and strength, decrease post-exercise recovery time, support cartilage and joints for flexibility and mobility, support cardiovascular performance to support weight loss, support muscle growth and energy production during exercise, and promote skin elasticity.
What the evidence actually supports
Including vitamin C alongside collagen is technically correct rather than decorative — vitamin C is a required cofactor for the enzymes that build collagen, so it belongs in the formula. Hydrolysed collagen peptides have reasonable evidence for skin elasticity and hydration, and a developing literature for joint comfort in active people. Covering types I, II and III is coherent, since they predominate in different tissues.
Where that evidence stops
Collagen is a poor protein for building or preserving muscle, and 'promotes lean muscle mass' is the claim to discount. It is low in leucine — the amino acid that triggers muscle protein synthesis — and contains no tryptophan, making it an incomplete protein. For someone on a GLP-1 worried about lean mass, whey or a complete plant protein does that job and collagen does not substitute for it. 'Supports cardiovascular performance to support weight loss' is a chain of inference with no support at any link. No amount per serving is published, and collagen research typically uses 2.5 to 15 g depending on the outcome. Nothing here relates to GLP-1.
Strengths and problems
Strengths
- Includes vitamin C, a genuine cofactor for collagen synthesis rather than a token addition
- Covers types I, II and III, which predominate in different tissues
- Reasonable evidence for skin elasticity and joint comfort
- Multi-size pricing published
Problems
- Collagen is a poor protein for muscle — low in leucine and lacking tryptophan
- The cardiovascular-to-weight-loss claim has no support at any step
- No amount per serving published, and research doses vary widely by outcome
- No relationship to GLP-1
What the manufacturer publishes
Publishes 1 of 8 standard terms.
- Intended use
- Sold as a dietary supplement for muscle, joint, skin and recovery support, not as a treatment for any condition.
- Directions
- Not publicly disclosed on the pages we captured.
- Warnings
- Not publicly disclosed on the pages we captured.
- Allergens
- Not publicly disclosed on the pages we captured.
- Third-party testing
- Not publicly disclosed on the pages we captured.
- Pricing
- $34.95, $94.25 and $166.30 depending on quantity at capture.
- Subscription
- Not publicly disclosed on the pages we captured.
- Refunds
- Not publicly disclosed on the pages we captured.
- Shipping
- Not publicly disclosed on the pages we captured.
May suit
Someone wanting collagen for skin or joints — not someone trying to protect muscle on a GLP-1, where a complete protein is the right choice.
Do not use if
- Your goal is preserving lean mass — use whey or a complete plant protein instead
- You have kidney disease without medical guidance on protein
- You need a specific gram dose for a specific outcome
Frequently asked
Is collagen good for muscle on a GLP-1?
It is protein, but it is the wrong protein for that job. Muscle protein synthesis is triggered largely by leucine, and collagen is low in it while containing no tryptophan at all — making it an incomplete protein. If your concern is losing muscle alongside fat, whey isolate or a complete plant protein blend is what the evidence supports. Collagen has its own reasonable uses in skin and joint health; muscle preservation is not one of them.
Sources
Captured . Manufacturer pages change — check the current version before relying on anything.