Wyeast | 4007 Malolactic Blend | Liquid Malolactic Bacteria | 125mL

Wyeast | 4007 Malolactic Blend | Liquid Malolactic Bacteria | 125mL

Malolactic Bacteria Accessories  
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  • This Wyeast blend is recommended for any wine requiring malic acid reduction
  • It will cover a broad range of temperature and pH conditions
  • 125mL is enough to innoculate 6 gallons of wine, cider, or mead
  • Wyeast has been a pioneer in craft brewing for over 35 years and is committed to creating the finest fermentation products available

A liquid Malo-lactic culture that contains a blend of ER1A and Ey2d malo-lactic cultures suitable for a fermentation pH of 2.9 or above and temperatures as low as 55°F (13°C).

Alcohol Tolerance: 12-18%
Optimum Fermentation Temp: 55-95°F

Notes from Wyeast: Fresh liquid cultures of L. oenos ER1A and EY2D provide rapid and complete malic acid to lactic acid reduction to balance and soften wines. ER1A and EY2D perform well in conditions of low pH and cool cellaring. Typical conditions of high wine acidity can be improved by reducing the harsh, sharp malic acid in the wine to the softer and smoother lactic acid. Other flavor improvements including vanilla and buttery notes can be anticipated. Natural occurring malic acid bacteria on fruit may be of inferior quality or quantity to complete malo-lactic fermentation. Vinter's Choice™ malolactic cultures are suitable of pH 2.9 or greater and cellar temperatures as low as 55°F.

Test Results (At this time we do not know what strains of malo-lactic were involved in this test.):

  • The performance of two strains of Leuconostoc oenos, Er1a and Ey2d, isolated from Oregon wines was evaluated in experimentally and commercially produced wines.
  • Experimental lots of Chardonnay, Pinot Blanc, and Pinot Noir were inoculated at the end of yeast fermentation at 18°C with approximately 106 cfu/ml of Er1a, Ey2d, ML-34, PSU-1, MLT-kli, and BB44-40
  • Under low pH conditions, the Oregon strains completed MALOLACTIC fermentations (MLF) more rapidly than the other commercially available strains: at pH less than 3.3 Er1a completed MLF in an average of 48 days, Ey2d in 94 days, MLT-kli in 127 days, and the other strains in 143 days or longer.
  • At pH greater than 3.4 all the strains completed MLF within 31 days.
  • Commercial wines were inoculated during yeast fermentations with 0.5 to 2.0% V/V Er1a and Ey2d grape juice cultures (109 cfu/ml) and wine cultures (108 cfu/ml). Er1a completed MLF in 1-2 months at cellar temperatures of 15°C or higher, but was sensitive to cooler temperatures.
  • Ey2d was more cold tolerant and completed MLF in 2-3 months at temperatures in 12-15°C
  • In addition, Ey2d retained MALOLACTIC activity at temperatures as high as 80°C when all other strains including Er1a were inactive.
Item # DYWM6
Shipping Eligible for Free Shipping Program
Availability California - In Stock
Pennsylvania - In Stock
Weight 0.25 LBS
Community Q&A

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Browse 7 questions Browse 7 questions and 20 answers
Why did you choose this?
MoreFlavor Store
I have 2 carboys to inoculate.
Valued C on Oct 31, 2022
Have used this product for years, has never failed to produce the desired result
Brian A on Oct 18, 2022
I have 2 carboys to inoculate.
Valued C on Oct 31, 2022
I bought this to mellow the acic in Saucignon Blanc. I have also used in Cabernet Sauvignon, Merlot and Malbac. It works well. used it after fermintation in Cabernet
Valued C on Oct 29, 2022
Have used this product for years, has never failed to produce the desired result
Brian A on Oct 18, 2022
Joe M on Oct 18, 2022
Larry B on Oct 14, 2022
I am using Frontenac grapes and want to use Malolactic fermentation to reduce the acidity
DUANE W on Oct 12, 2022
good success in the past
chris m on Oct 12, 2022
for MLF of red wine
Max H on Oct 10, 2022
Need it for mlf in wine
Pete on Oct 7, 2022
cheapest option
Steven H on Oct 4, 2022
to use when making wine from red juice
Marc F on Oct 3, 2022
previous purchase
Kenneth S on Aug 20, 2022
I have used it successfully for 5+ years.
Charles C on Aug 4, 2022
Will be it for my Cabernet Sauvignon malolactic fermentation
Boris K on Apr 12, 2022
To smooth out a raspberry mead
Robert L on Mar 31, 2022
for MLF
Pete on Feb 21, 2022
CH16 ordered last month didn't work so trying a different bacteria
Ross Parke on Dec 6, 2021
have used wyeast products before, all are excellent, I have found this culture to do its job properly on prior occasion
Richard on Nov 4, 2021
Based on reviews on your site
Tom S on Nov 4, 2021
It mellows wine and removes harsh acid taste.
David M on Nov 2, 2021
For red wine
Gary on Oct 28, 2021
We have used this for years and are happy with the results
Leslie H on Oct 22, 2021
good reviews, recommended by local winemaker store
ROBERT J T on Oct 21, 2021
Have used Wyeast 4007 many times before and never had it fail. Seems to work even at lower pH ranges.
Brion K on Oct 14, 2021
It worked well the last time I bought it
Jim E on Oct 11, 2021
Friend recommended
Jon S on Sep 29, 2021
Erin K on Sep 29, 2021
Ensure Malolactic fermentation
Angelo Di S on Sep 25, 2021
assuming it's a blend of their 2 strains, each optimized by different temp ranges
David K on Sep 24, 2021
recommended to me
Dennis B on Sep 15, 2021
used in the past with good results
Richard D I on Sep 11, 2021
Liked the description
jim O on Sep 6, 2021
works well.
Terry Sciarrino on Aug 26, 2021
small batch wine making
doneta s on Aug 24, 2021
Good product
Robert B on Aug 20, 2021
Success in the past with this product and good reviews
Michael H on Aug 13, 2021
removes the brightness and makes it smooth
John S G on Aug 11, 2021
Used this product before with good success; preparing for this fall's winemaking
Robyn M on Jul 2, 2021
Used it before
Valued C on May 7, 2021
Trying new technique
Roman J on Mar 3, 2021
Used before
Jeff P on Feb 9, 2021
Clearly provides malolactic benefits in a size for a wine kit.
lester c on Dec 22, 2020
Past use
Robert W on Dec 19, 2020
I have a Seyval Blanc with Ph 2.9 and need to adjust acidity
Larry L on Dec 14, 2020
New to ML conversion, have used wyeast liquid products previously, relatively inexpensive.
bryan m on Oct 30, 2020
Priced affordably for a first time user.
Thurston E P on Oct 29, 2020
Easy to use product.
Bill M on Oct 29, 2020
It is for cider not wine. Cost.
Jim F on Oct 28, 2020
because i know it works
Tim B on Oct 20, 2020
Used it in the past with good results
Craig on Oct 20, 2020
I bought this to mellow the acic in Saucignon Blanc. I have also used in Cabernet Sauvignon, Merlot and Malbac. It works well. used it after fermintation in Cabernet
Valued C on Oct 29, 2022
Joe M on Oct 18, 2022
I've used Acti-ML in the hydration phase for dry malolactic bacterias. Already hydrated, I presume this is not necessary when using Wyeast 4007 Liquid Malolactic Bacteria. Is this correct?
Don on May 16, 2019
BEST ANSWER: I've used Opti Malo with the liquid malo. It's another nutrient and aimed more towards yeast already hydrated, unlike the acti mal which seems to be formulated for the rehydration process.
Will this work in co-inoculation with W15 in Chardonnay or Pinot Noir? Would you still use Opti-Malo +
Diane Rudnick on Jun 22, 2020
BEST ANSWER: it should work at co-inoculation yes. Whether to use opti malo is part personal preference and part dependent on nutrition analysis. Usually the yeast activity is enough to provide all that’s needed. I’ve personally stopped inoculating with either yeast or malo. No nutrient adds if grapes are healthy. Native ferments have been excellent and easy and delicious.
Should this be shipped on ice?
Peter Gabriel on Oct 15, 2019
BEST ANSWER: Hi Peter, yes we always recommend shipping liquid cultures on ice. Though we can't guarantee it'll arrive cold, it's helpful to keep it cold for as long as possible in shipping.
Storing for future use?
Jerry Martinez on Oct 6, 2019
BEST ANSWER: I’ve only stored for future use once. As long as it stays refrigerated. I did this with the malolactic last year as I made my whites a little later than normal. It was fine, worked well. As soon as I receive any orders of yeast from More Wine I immediately date them, write which type of wine I will be using with that certain yeast and then refrigerate. I usually by multiple kinds of yeast prior to buying my wine grapes or juice but I usually have an idea of what I want. Sometimes my local wine supplier does not get certain varieties that I’m looking for. Also, I enjoy More Wine’s yeast pairing guide!
Is it recommended to use OptiMalo nutrients with this liquid MLB? Or are nutrients already added in the liquid culture?
Kevin E Hart on May 29, 2019
BEST ANSWER: You will need to add a nutrient along with the bacteria. OptiMalo is not in the bacteria solution. The bacteria can perform MLF without OptiMalo, but no guarentee.
Is the packaging good enough for International Shipping without Ice Pack?
Kyaw Thuya on Mar 10, 2019
BEST ANSWER: Hello Kyaw - Wyeast's packaging is extremely sturdy as these are intended to puff up without exploding. It should be fine for Intl. shipping without ice, however may require some propagation to regain vitality.
More wine fermentation guide says 20g of Acti-ml per 1g of bacteria, this is liquid @ 125ml, so how much Acti-ml do I add for this product?
Preston Hanson on Oct 27, 2022
BEST ANSWER: because of the density
20 grams of liquid of that kind would equal 20 ml

4.8 / 5.0
11 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Rated 5 out of 5
Convenient size and excellent performance
I've used a lot of Wyeast products in my beer brewing. Typical of the yeasts I've used, this came to me fresh, and I pitched into my 2.9 ph wine. It started MLF within 24 hours and has been perking along nicely for 2 weeks at 70 degrees.

I'm new to winemaking, with this year being my first crop of Pinot Noir. (20 vines, 135 # of grapes). Wish me luck!
November 8, 2021
over 2 years ago
Rated 5 out of 5
Works well
It’s working great in a high alcohol wine, coinoculated with yeast and it seems fine won’t know about any flavors till kater
September 28, 2021
over 2 years ago
Rated 5 out of 5
Good MLF culture
This MLF culture needs to be kept cold. I had it shipped in an ice pack and it seem to work well. The culture was quite cold when it arrived, and I kept it in the fridge until needed. Too early to see how well it worked but I think it’s going to be great!
Bill C
February 8, 2021
over 3 years ago
Rated 5 out of 5
Good product
Arrived on time. Added an ice pack to keep them cool. Will buy again.
November 21, 2020
over 4 years ago
Rated 3 out of 5
Have not tried to use it yet - too early in fermentation
November 8, 2020
over 3 years ago
Rated 5 out of 5
It works!
Malo is going great. Very happy.
June 9, 2020
over 4 years ago
Rated 5 out of 5
First Time - Worked Great
I used this on a Chardonnay Kit. Worked great. Was complete in 2.5 weeks. Softened the acidity of the wine. Very nice.
January 24, 2020
over 4 years ago
Rated 5 out of 5
Started right up after primary was complete. Keeping temp 70-75
October 8, 2019
over 4 years ago
Rated 5 out of 5
Rapid MLF
Takes off fast and isn't picky! None of the stinky MLF aromas that some other strains produce.
October 3, 2019
over 4 years ago
Rated 5 out of 5
Worth the effort & small expense
I have used this ML culture before with great results. Paper chromatography verified results. Added at the end of the alcohol fermentation after first racking. Economical to use compared to others I used. Pretty hard to show a picture of something that is on the pallet, but a double gold Merlot is proof for me.
April 27, 2019
over 5 years ago