What These Products Are
Both Kirkland Signature Minoxidil and Member’s Mark Minoxidil are topical hair-regrowth solutions containing 5% minoxidil, the same active ingredient used in many over-the counter hair loss treatments. They are intended for the same purpose: to help stimulate hair growth and slow thinning in men.
Same Active Ingredient
At the core, both products use minoxidil 5% as the active ingredient the concentration widely accepted and FDA approved in markets like the US for effective hair regrowth when used consistently. There’s no difference here.
The Big Surprise: Same Manufacturer
One of the biggest misconceptions people have is that Kirkland and Member’s Mark are fundamentally different because they’re sold under different brand names. In reality:
- Independent sellers and product pages state that both brands are manufactured by Perrigo, a large pharmaceutical contract manufacturer that produces private-label minoxidil for many retailers.
- Kirkland products are manufactured for Costco by Perrigo, while Member’s Mark products are manufactured for Sam’s Club/Walmart’s private brand, but the underlying supplier and factory processes are essentially the same.
DailyMed product labels for Kirkland confirm “Manufactured by Perrigo” in Israel and packaging by Perrigo in the United States and the same holds true on labels for equivalents like Member’s Mark.
This means: same active ingredient, same strength, same manufacturer. The key differences most users notice come down to:
- label design
- packaging
- retailer pricing
- stock availability not the formula itself.
| Contents | Kirkland Minoxidil (Costco) | Member's Mark Minoxidil (Sam's Club) |
|---|---|---|
| FDA Approved? | ✅ | ✅ |
| Manufacturer? | Perrigo | Perrigo |
| Active Ingredient? | Minoxidil | Minoxidil |
| Strength? | 5% | 5% |
| FDA Link | View FDA Listing | View FDA Listing |
| Same Formulation? | Yes | Yes |
| Country of Origin? | USA | USA |
| Ingredients | Alcohol, Propylene Glycol, Purified Water, Minoxidil (Active Ingredient) | Alcohol, Propylene Glycol, Purified Water, Minoxidil (Active Ingredient) |
Branding vs Chemistry
Branding matters in how people perceive quality. Kirkland is one of the most recognisable names in generic minoxidil because Costco pushes it heavily. Member’s Mark is less hyped but often cheaper because it doesn’t carry the same “brand prestige.”
But when you’re talking about the actual product that goes on your scalp, the differences are cosmetic. Both feature the same minoxidil 5% concentration and, according to public label information and seller disclosure, are produced by the same pharmaceutical contract manufacturer.
Does This Impact Effectiveness?
In practice:
- Users report virtually identical results when switching between Kirkland and Member’s Mark products.
- Any variation in feel, scent, or drying time is typically due to minor differences in inactive ingredients or batch variations not the minoxidil itself.
- Because both brands come from the same supplier, clinical performance should be indistinguishable.
Price and Availability
Because Member’s Mark isn’t as aggressively marketed as Kirkland, it is often easier to find at similar or lower prices but the actual supply chain may vary by region. Kirkland products sometimes become harder to source outside the US, leading buyers to choose Member’s Mark as a reliable alternative.
Bottom Line
There is no meaningful difference between Kirkland Minoxidil and Member’s Mark Minoxidil. They contain the same strength of the same active ingredient and are produced by the same third-party manufacturer (Perrigo). Any claims that one brand is “superior” are based on branding, not chemistry.
