Short answer: Mielle is a few cents cheaper per mL on Amazon.ca today ($0.25 vs $0.28). Plant of Life is the shorter, cleaner formula: 7 ingredients with castor oil first, no soybean oil and no preservatives, against 29 ingredients with soybean oil first in Mielle's Well.ca listing.
If you want a simple label made with organic oils, buy Plant of Life Rosemary & Castor Oil. If the lowest sticker price is all that matters, Mielle on Amazon.ca wins by 3 cents per mL.
Plant of Life Rosemary & Castor Oil
$16.95 CAD for 60 mL, or $15.26 with subscribe and save
- 7 ingredients: castor, jojoba, rosemary, peppermint, tea tree and lavender oils plus vitamin E.
- Free from sulfates, soybean oil, parabens, silicones, preservatives and alcohol.
- 4.9 out of 5 from 20 reviews. Ships from a Canadian seller, free shipping on orders over $49.
How we compared
We compared label facts and prices only. Plant of Life details come from our own product page. Mielle's price, size and full ingredient list come from its Well.ca and Amazon.ca listings. Prices were checked October 28, 2026 in Canadian dollars. Prices change often, so check before you buy.
Head to head
| Plant of Life Rosemary & Castor Oil | Mielle Rosemary Mint Scalp & Hair Strengthening Oil | |
|---|---|---|
| Size | 60 mL (2 oz) | 59 mL (2 oz) |
| Price (CAD) | $16.95, or $15.26 on subscribe and save | $14.99 on Amazon.ca, $18.99 regular on Well.ca |
| Price per mL | $0.28 ($0.25 on subscription) | $0.25 Amazon.ca, $0.32 Well.ca regular |
| Number of ingredients | 7 | 29 (Well.ca listing) |
| First ingredient | Castor oil | Soybean oil |
| Soybean oil | No | Yes |
| Water and preservative | None | Aqua, phenoxyethanol (Well.ca listing) |
| Wheat germ oil | No | Yes |
| Organic | Blend of organic oils, USDA Organic seal on label | No certification shown on the listings we checked |
| Bottle | Amber dropper bottle | Dropper bottle, material not listed |
| Ratings | 4.9/5 from 20 reviews (our store) | 4.0/5 from 10 ratings (Amazon.ca listing) |
| Where sold | plantoflifeco.com | Amazon.ca, Well.ca |
Ingredients, side by side
Plant of Life Rosemary & Castor Oil: Castor (Ricinus communis) Oil, Jojoba (Simmondsia chinensis) Oil, Rosemary (Rosmarinus officinalis) Oil, Peppermint (Mentha piperita) Oil, Tea Tree (Melaleuca alternifolia) Oil, Lavender (Lavandula angustifolia) Oil, Mixed Tocopherols (Vitamin E).
Mielle Rosemary Mint (as listed on Well.ca): Glycine Soja (Soybean) Oil, Ricinus Communis (Castor) Seed Oil, Aloe Barbadensis Leaf Extract, Aqua, Benzyl Nicotinate, Biotin, Carthamus Tinctorius (Safflower) Seed Oil, Cocos Nucifera (Coconut) Oil, Eucalyptus Globolus (Eucalyptus) Leaf Oil, Glycerin, Lavandula Angustifolia (Lavender) Oil, Melalueca Alternifolia (Tea Tree) Leaf Oil, Mentha Piperita (Peppermint) Oil, Menthol, Ocimum Basilicum (Basil) Leaf Extract, Oryza Sativa (Rice) Bran Oil, Pogostemon Cablin (Patchouli) Leaf Oil, Prunus Amygdalus Dulcis (Sweet Almond) Oil, Retinyl Palmitate, Rosmarinus Officinalis (Rosemary) Leaf Oil, Salvia Officinalis (Sage) Oil, Simmondsia Chinensis (Jojoba) Seed Oil, Tocopheryl Acetate, Triticum Vulgare (Wheat) Germ Oil, Vitis Vinifera (Grape) Seed Oil, Phenoxyethanol, Citronellol, Limonene, Linalool.
Heads up: the Amazon.ca listing shows a different version of Mielle's list. It starts with grape seed oil and soybean oil and adds horsetail, nettle and burdock extracts. Both versions contain soybean oil. Formulas change, so read the label on the bottle you receive.
What the ingredient lists tell you
The base oil is different. Ours is built on castor oil and jojoba, the two classic hair oils. Mielle's Well.ca list leads with soybean oil, a light and inexpensive carrier. Neither is "bad", but if you are paying for a rosemary and castor routine, you probably want castor doing the heavy lifting.
Mielle packs more extras. Biotin, retinyl palmitate, menthol, benzyl nicotinate and a long list of botanical extracts. If you like a busy label with lots of actives, that is the appeal.
Ours keeps it short. Seven ingredients, no water, no preservative, no wheat germ oil. Easy to read, easy to know what is on your scalp.
Want to go deeper on the two hero ingredients? Read our guides to rosemary oil for hair growth and castor oil for hair growth.
Price per mL: the honest math
Same size, near the same price. On Amazon.ca, Mielle is $14.99 for 59 mL, which is $0.25 per mL. Ours is $16.95 for 60 mL, which is $0.28 per mL. That is about 3 cents per mL, or roughly $1.96 per bottle.
Two ways to close that gap: subscribe and save drops ours to $15.26 ($0.25 per mL), and new customers get 10% off the first order with WELCOME10. At Well.ca's regular price of $18.99, Mielle costs more than ours.
Organic and bottle
Our Rosemary & Castor Oil is made with a blend of organic oils and the label carries the USDA Organic seal. It comes in an amber dropper bottle so you can put the oil right on your scalp.
Mielle's Well.ca description mentions "natural, organic ingredients", but neither listing we checked shows an organic certification. It also comes with a dropper applicator. The listings do not say what the bottle is made of.
How to use each one
The directions are nearly identical, which tells you these two compete for the same routine.
Plant of Life: Section hair and scalp into 4 parts. Apply a small amount to the scalp, massage with your fingers, comb through to the ends and leave in. For split ends, apply to the ends, cover with a processing cap for 10 minutes, then rinse and shampoo. Use daily as needed or 3 days a week, and give it 4 weeks of steady use.
Mielle: Section hair into 4 parts, apply a small amount to the scalp, massage, comb through and leave in. For split ends, apply to ends under a processing cap for 10 minutes, then rinse and shampoo.
Tip for both: wear a hair wrap or lay a light towel on your pillow at night.
Who should buy which
Buy Plant of Life Rosemary & Castor Oil if:
- You want castor oil as the first ingredient, not soybean oil.
- You want a 7 ingredient label with no preservatives and no wheat germ oil.
- Organic oils and a USDA Organic seal matter to you.
- You like buying from a Canadian seller with a 30-day satisfaction guarantee.
Buy Mielle Rosemary Mint if:
- The lowest price on Amazon.ca today is your top priority.
- You want biotin and a long list of botanical extracts in one bottle.
- You are already placing an Amazon.ca order anyway.
Love the mint but want our label? Plant of Life also makes Rosemary & Mint Oil: $16.95 for 60 mL, castor oil first, with rosemary, jojoba, peppermint, eucalyptus, menthol, tea tree, coconut oil and biotin. Nine ingredients, no soybean oil.
What to look for in a rosemary hair oil
- First ingredient: it tells you what most of the bottle is.
- Ingredient count: shorter lists are easier to check for anything you avoid.
- Price per mL: compare the same size, and factor in subscribe and save.
- Organic seal: look for it on the label, not only in the description.
- Dropper bottle: makes it easy to apply oil to the scalp, not your palm.
FAQ
Is Plant of Life Rosemary & Castor Oil the same as Mielle Rosemary Mint?
No. Both are ready-to-use rosemary oils in a 2 oz bottle with nearly the same directions, but the formulas are very different. Ours has 7 ingredients led by castor oil. Mielle's Well.ca listing shows 29 ingredients led by soybean oil, with water, glycerin and phenoxyethanol.
Does Mielle Rosemary Mint oil contain soybean oil?
Yes. Glycine Soja (soybean) oil is the first ingredient on the Well.ca listing, and it appears in the Amazon.ca version of the list too. If you are trying to avoid soybean oil, Plant of Life Rosemary & Castor Oil lists it as one of the things it is free from.
Which is cheaper in Canada?
On October 28, 2026, Mielle was $14.99 for 59 mL on Amazon.ca ($0.25 per mL) and $18.99 regular on Well.ca. Plant of Life is $16.95 for 60 mL ($0.28 per mL), or $15.26 with subscribe and save, which matches Mielle's Amazon.ca price per mL.
Can I use rosemary and castor oil every day?
Yes. Our directions say to use it daily as needed or three days a week, leave it in and style as usual. Give it four weeks of steady use. If oil on your pillow bothers you, apply at night and wear a hair wrap.
Is Mielle rosemary oil organic?
The brand is called Mielle Organics, and the Well.ca description mentions organic ingredients. But neither listing we checked shows an organic certification. Plant of Life Rosemary & Castor Oil is made with a blend of organic oils and carries the USDA Organic seal on its label.
The bottom line
Mielle saves you about 3 cents per mL on Amazon.ca. Plant of Life gives you castor oil first, 7 ingredients, organic oils and no preservatives for nearly the same price. Get Plant of Life Rosemary & Castor Oil for $16.95, and use code WELCOME10 for 10% off your first order.
