“Yotsuba Fermented Butter Unsalted 450g” (よつ葉 発酵バター 無塩 450g) is an unsalted butter for which Yotsuba Milk Products Co., Ltd. (よつ葉乳業) is listed as the manufacturer, and it is sold on Rakuten Ichiba by こだわり食材 572310.com 楽天店. It comes in one kind, 450g × 1, needs refrigeration (10°C or below), and its product name carries “【クール配送品】” (chilled delivery item). This article organizes what the Rakuten Ichiba product page and reviews state into five points: amount, best-before date, ingredient labeling, suitability as a gift, and reviews. The feature we could confirm on the product page is that it is an unsalted type made by fermenting cream, the raw material taken from raw milk, with lactic acid bacteria.
At a Glance
Key points
- An unsalted type with no salt used, fermented with lactic acid bacteria. The product description says it was made by fermenting cream, the raw material taken from raw milk, with lactic acid bacteria (the shop’s description)
- The ingredient is raw milk; the place of origin is Hokkaido. The type classification is butter, and the amount is 450g × 1. There are no options to choose from
- Keep refrigerated (10°C or below), and the product name carries “【クール配送品】” (chilled delivery item)
- Rakuten rating 4.81 (463 reviews). As shown on Rakuten Ichiba, viewed October 15, 2026; we read 67 of the reviews. It may not reflect the product’s current condition
Watch out for
- The number of days for the best-before date and the allergen labeling are not found on the product page: Not confirmed. We also found no guidance on noshi (a Japanese gift-wrapping label), wrapping or message cards, so labeling for gift use cannot be confirmed
Suits: People who want to use unsalted butter, and people who want to try fermented butter
The comparison covers the 3 butters featured on Ochinity (as of October 15, 2026). Each value is as of the date its own article was researched and may differ from the current listing. The features and ingredients are from the Rakuten Ichiba product page (viewed October 15, 2026). The rating is as shown on Rakuten Ichiba (viewed October 15, 2026) and may not reflect the product’s current condition.
Compared with 3 Similar Items
Among the 3 butters featured on Ochinity (as of October 15, 2026). All 3 are 450g. Each value is as of the date its own article was researched and may differ from the current listing. Ratings are as shown on Rakuten, and because the review counts differ, how easily each figure moves also differs. The review trends in this article are from the 67 reviews we read, and the rating may not reflect the product’s current condition. This article is listed first.
| Product | Salt | Delivery temperature | Rakuten rating |
|---|---|---|---|
| Yotsuba Fermented Butter UnsaltedThis article; described as fermented with lactic acid bacteria (the shop’s description) | Not usedunsalted | Chilled | 4.81463 reviews |
| Hokkaido Yotsuba Butter Unsaltedママパン | Not used | Chilled | 4.744,548 reviews |
| Calpis Butter Salted | Usedsalted | Frozen | 4.67633 reviews |
You can go to each product’s article from its name. Salt follows the ingredient list and product name stated in each article.
- Within this table (3 butters, as of October 15, 2026), the unsalted types with no salt used are this product and Hokkaido Yotsuba Butter from ママパン, two in all; this product’s description says it was made by fermenting with lactic acid bacteria
- This product’s Rakuten review count is 463, fewer than the 4,548 of the ママパン item and the 633 of Calpis Butter (a weak point)
Basic Information
- Product Name
- Yotsuba Fermented Butter Unsalted 450g (Yotsuba Milk Products; よつ葉 発酵バター 無塩 450g)
- Shop
- こだわり食材 572310.com 楽天店
- Manufacturer
- Yotsuba Milk Products Co., Ltd. (よつ葉乳業株式会社) (as stated on the product page)
- Amount
- 450g × 1
- Ingredients / Place of Origin
- Raw milk / Hokkaido
- Storage
- Keep refrigerated (10°C or below). The best-before date is shown on the product (number of days: Not confirmed)
- Allergen Labeling
- Not confirmed
- Shipping
- “【クール配送品】” (chilled delivery item) in the product name
- Noshi / Gift
- No guidance found: Not confirmed
This list transcribes what is stated on the product page. However, the “not confirmed” labels and any notes we add are our own.
The ingredient is raw milk. The allergen labeling is not stated on the product page. If you have an allergy, ask the seller before buying, or be sure to check the label on the product when it arrives (Reference: Consumer Affairs Agency, Japan, “About Allergen Labeling”, accessed October 15, 2026).
See the transcribed details, sources and “Not confirmed” items (12 items)
This list transcribes what is stated on the product page. However, the “not confirmed” labels and any notes we add are our own.
- Product Name
- Yotsuba Fermented Butter Unsalted 450g (Yotsuba Milk Products; よつ葉 発酵バター 無塩 450g)The product name shown on the Rakuten page is a long string with many search keywords. Only the product-name part is shown here.
- Type of Food
- Butter (type classification)Source: product description on the Rakuten Ichiba product page (accessed October 15, 2026)
- Amount
- 450g × 1. The number of servings is not stated: Not confirmedSource: product description on the Rakuten Ichiba product page (accessed October 15, 2026)
- Options
- There are no options to choose from (the amount selection field is empty, and it is a single kind, 450g × 1)Source: Rakuten Ichiba product page (accessed October 15, 2026)
- Storage Method
- Keep refrigerated (10°C or below)Source: product description on the Rakuten Ichiba product page (accessed October 15, 2026)
- Best-Before Date
- The page says it is shown on the product. The number of days is not found on the product page: Not confirmedSource: product description on the Rakuten Ichiba product page (accessed October 15, 2026)
- Precautions After Opening
- Not found on the product page: Not confirmed
- Country of Origin of Ingredients
- The page states the ingredient as raw milk and the place of origin as HokkaidoSource: product description on the Rakuten Ichiba product page (accessed October 15, 2026)
- Processing Location
- Not confirmed (the manufacturer’s address is stated, but we did not find it shown as the processing location)
- Condition / How to Eat (Cooking Required?)
- It is presented as butter. The product description says it can be used widely for sweets and cooking. We did not find guidance on whether to eat it as it isSource: product description on the Rakuten Ichiba product page (accessed October 15, 2026)
- Shipping
- The product name carries “【クール配送品】” (chilled delivery item). Nothing further on the shipping method was found: Not confirmedSource: Rakuten Ichiba product page (accessed October 15, 2026)
- Manufacturer
- Yotsuba Milk Products Co., Ltd. (よつ葉乳業株式会社; Otofuke Town, Kato District, Hokkaido). The seller, こだわり食材 572310.com 楽天店, is not the manufacturerSource: product description on the Rakuten Ichiba product page (accessed October 15, 2026)
- Shop
- こだわり食材 572310.com 楽天店
What Public Reviews Say
We organized the Rakuten Ichiba product reviews by viewpoint. The rating figures are as of the viewing date and change afterward. What follows are trends within what we read, and these trends may not reflect the product’s current condition.
| Site | Rating | Number of Reviews | Date Accessed |
|---|---|---|---|
| Rakuten customer reviews (product page) | 4.81 / 5 | 463 | October 15, 2026 |
Breakdown of ratings: 5★ 384 / 4★ 72 / 3★ 7 / 2★ 0 / 1★ 0 (as shown on Rakuten Ichiba; accessed October 15, 2026)
What we read: the first 60 reviews in Rakuten’s default order (posted October 2007 to May 2026, latest May 2026) and all 7 reviews rated 3★ (posted November 2006 to April 2016), 67 in total. There were none rated 1★ or 2★. Only 1 review was posted in the last 2 years (since October 15, 2024); the other 66 were posted in 2022 or earlier. These are trends within what we read and may not reflect the product’s current condition.
Because there are 0 reviews rated 1★ or 2★, we cannot show a trend for low ratings. The 7 reviews rated 3★ are divided among a mild taste, price, aroma preferences, amount and so on. The counts below are approximate figures from reading the text, and exclude posts only about delivery or shop service.
What Reviewers Praise
Aroma, flavor and richness of fermented butter (about 32 of 60)
Reviews saying the aroma is good, the flavor is different, or it is rich numbered about 32 of the first 60 in the default order. Some mention the aroma while baking, or the flavor when it is spread on bread.
Used for bread and sweets (about 44 of 60)
About 44 of the first 60 reviews in the default order said they use it for bread, cookies, cakes and the like, or for baking sandwich loaf bread in a home bread maker. There are also mentions of adding a little to cooking (reviewers’ own descriptions).
Buying it again and again (about 16 of 60)
Reviews saying they buy it repeatedly, always buy it, or cannot do without it numbered about 16 of the first 60 in the default order.
Source: Rakuten customer reviews (accessed October 15, 2026)
What Reviewers Note
Distinctive aroma and tanginess (12 of 67)
Of the 67 reviews we read, 12 touched on a yogurt- or cheese-like aroma or tanginess as a characteristic of fermented butter. Most describe it as a feature of the aroma; 3 wrote that it was not to their taste or that tastes differ, and 2 of those 3 went on to say they came to like it with use or that it is good in sweets.
How to check: the product page’s description that it is made by fermentation is summarized under “At a Glance” in this article.
Pricey or price increases (9 of 67)
9 of the 67 reviews we read said the price is on the high side or has gone up. 2 of them are 3★ reviews. Because prices change, this article does not list an amount.
Source: Rakuten customer reviews (accessed October 15, 2026)
Summary: Is This the One for You?
Why choose it: you want an unsalted butter with no salt used, and you want a type made by fermenting with lactic acid bacteria. If those two are your conditions, this product fits the product page’s description (a weak point: the number of days for the best-before date and the allergen labeling are Not confirmed).
- The description says it is an unsalted type made by fermenting cream, the raw material taken from raw milk, with lactic acid bacteria, and the ingredient is raw milk
- Rakuten rating 4.81 / 5 (463 reviews). Among the 67 we read, voices mentioning aroma, flavor and richness (about 32 of 60) and voices using it for bread and sweets (about 44) were the most common. However, most posts are from 2022 or earlier
Other options: if you want one with more Rakuten reviews, there is Hokkaido Yotsuba Butter (Unsalted) 450g (ママパン) (no salt used, chilled, rating 4.74, 4,548 reviews, as of October 13, 2026); if you want salted butter delivered frozen, there is Calpis Butter (Salted) 450g (frozen delivery, rating 4.67, 633 reviews, as of October 13, 2026).
The basis for this section is the Rakuten Ichiba product page and Rakuten customer reviews (accessed October 15, 2026). The review trends are from the 67 reviews we read and may not reflect the product’s current condition.
Prices, stock, shipping fees, and delivery dates are subject to change. This article’s information-as-of date is October 15, 2026. Please be sure to check the listing at the link before purchasing.
This article contains affiliate links (advertising). Editorial Policy
This article organizes information publicly available on the Rakuten Ichiba product page and Rakuten customer reviews. Product information such as amount, storage method, and ingredients may change. Please check the seller’s labeling for the latest information.
Comments on taste or quality are summarized from third-party posts cited with their source, and are not Ochinity’s own evaluation. Our approach to writing articles is described in our Editorial Policy.
Information as of: October 15, 2026 / Sources: Rakuten Ichiba “こだわり食材 572310.com 楽天店” product page, Rakuten customer reviews, Consumer Affairs Agency, Japan, “About Allergen Labeling”
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