FDA compliant and exempt from PMO item 15r by item JJ(6)(a)&(b)

OMRI listed


PhytoMast® is a veterinary device to be used at dry-off. The primary effect of PhytoMast® is to provide a protectant film barrier between the environment and the teat canal lining. The viscous oil paste coats the surface of the teat canal. Its secondary effect is due to antiseptic, disinfectant properties.  It is a non-antibiotic, non-prescription product. 

1 box of PhytoMast® contains:

12 aseptic Plastet® infusion tubes, each filled with 12 ml PhytoMast® and 12 individually wrapped alcohol pads. The components of PhytoMast® are considered Common Food, GRAS and/or FEMA-GRAS listed. 

The components of each 12 ml tube of PhytoMast ® are: Olive oil (21CFR105(a)), Thyme essential oil FEMA-GRAS#3063, Angelica root oil FEMA-GRAS #2087; Wintergreen leaf oil FEMA-GRAS#3112. Licorice root oil FEMA-GRAS#2628; Vitamin A (GRAS); Vitamin D (GRAS); Vitamin E (GRAS). 

For best effect, refrigerate prior to use. The paste of viscous oil creates a temporary barrier film coating in the teat canal. The cow, doe or ewe will form a natural keratin plug in 7-10 days. The secondary effect of PhytoMast ® is due to the antiseptic, disinfectant properties of thymol. Historically, thymol was in the Haver-Glover Laboratories’ “Intramammary Disinfectant” product for use in the bovine udder. That product was in commercial distribution between 1928 and 1935. As stated in the Haver-Glover catalogue: “oils coat the teat lining”.1

IMPORTANT: PhytoMast® creates a physical barrier via the oily film coating between the outside environment and the teat canal and makes no claims against specific pathogens. 

Warnings and Cautions

If by accident a dry cow is milked into the tank, studies in peer-reviewed professional journals demonstrate that PhytoMast® does not cause positive results with the Delvo®Test P nor does it interfere with antibiotic residue testing in the Charm® SL Beta-lactam test. Studies using FDA methodology have shown a 24-hour milk withhold and 13-day meat withholding prior to sending to slaughter.2,3,4 Not withholding milk when a substance has been introduced into the teat canal, even if GRAS, is against the PMO.

For animal use only. Keep out of the reach of children. 

PhytoMast® is not considered hazardous. The SDS is available upon request.

Adverse Reactions

An adverse reaction can result anytime something is introduced into the teat in a less than hygienic manner. PhytoMast ® should be introduced into the teat only after utilizing the alcohol pad component to clean the teat end to make sure no environmental contaminants are introduced into the teat. 


The PhytoMast ® box, alcohol pads and 12 Plastet® syringes should be stored in a cool dry location. For best effect, refrigerate prior to use. Do not allow it to freeze.

Indications, Dosage and Administration

PhytoMast®   is indicated as a protectant film coat for the teat canal by providing a temporary physical barrier for dairy cattle, goats and sheep at dry-off.

The following steps will help to avoid introducing infectious material during intramammary infusion. 

Administration & Dosage of PhytoMast ®

There are 2 steps for effective dry-off:

1) Stop milking the cow/goat/sheep and wait 5 days and then milk her one final time. 

This 5-day period of no udder stimulation signals the brain to stop making milk. On the 5th day of not milking her, milk the udder out completely one last time to clear out all residual milk. This residual milk is NOT for human consumption.

2) With an alcohol pad for each teat end, clean the teat/s furthest away and then the closer one/s. Allow to air dry. Then take the cap off the PhytoMast® tube and, without touching the inner tip, insert each tube tip into the closest teats first, slowly infusing the entire contents of 1 tube per teat, followed by infusing the two teat/s further away. Use 1 tube per quarter for cows and 1 tube per half for goats and sheep.

By NOT massaging PhytoMast® up into the udder, the physical barrier film coating created by PhytoMast® is retained in the teat canal area.

To further enhance a physical barrier, dip with an external teat sealant (or dip with a standard external germicide) before releasing the cow, doe or ewe.

Monitor dry dairy animals regularly for signs of mastitis. The natural keratin plug takes about 1 week to start forming and remains in place until about 1 week prior to freshening. Always keep the animal in an area which is clean and dry, especially during the critical periods just after dry-off and prior to giving birth.  The milk from the cow, doe or ewe can go into the bulk tank once the colostrum has changed to milk. 

Use Only As Directed – Not For Human Use – Manufactured in the USA in a cGMP registered facility for CowMaster, LLC.

PhytoMast® is registered as a non-feed botanical formulation for bovine udder health. 

US Class Code: 006, 018, 044, 046, 051, 052 

International Class 005: Pharmaceutical and veterinary preparations; sanitary preparations for medical purposes; dietetic substances adapted for medical use, food for babies; plasters, materials for dressings; material for stopping teeth, dental wax;

disinfectants; preparations for destroying vermin; fungicides, herbicides. 

For more information contact:
Dr. Karreman’s Veterinary Solutions PO Box 6 Saxapahaw, NC 27253 1-833-269-6787 Printed February 2023


1A Manual of Veterinary Therapeutics: Biologicals, Pharmaceuticals, Surgical Supplies, 3rd edition [pg.98]  1928 and 4th edition [pg.115].

2 K.A.E. Mullen, E. Beasley, J.Q. Rizzo, S.P. Washburn, R.E. Baynes, S.E. Mason, K.L. Anderson Vet Rec Open 2017 Aug 11;4(1) 

Potential of phytoceuticals to affect antibiotic residue detection tests in cow milk in a randomised trial

3 S.E. Mason, K.A.E. Mullen, K.L. Anderson, S.P. Washburn, J.L. Yeatts, R.E. Baynes Food Addit Contam Part A Chem Anal Control Expo Risk Assess 2017 May;34(5):740-749.

Pharmacokinetic analysis of thymol, carvacrol and diallyl disulfide after intramammary and topical applications in healthy organic dairy cattle

4 C.S. McPhee, K.L. Anderson, J.L. Yeatts, S.E. Mason, B.M. Barlow, R.E. Baynes Dairy Sci 2011 Apr;94(4):1738-43. Milk and plasma disposition of thymol following intramammary administration of a phytoceutical mastitis treatment

Additional information

Weight 1 lbs
Dimensions 7 × 7 × 12 in
Tube Length

Short Tip Tubes, Long Tip Tubes


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A Plant-Based, Natural Formula

  • No antibiotics
  • All ingredients are GRAS
  • Clinically proven and safe by independent, peer-reviewed scientific studies
  • Great for dry-off
  • Improved udder health
  • USDA allowed for organic milk products.
  • OMRI listed

Apply:1 tube per quarter at dry-off.

Suggested Milk Withhold: During use & 24 hours after last use and 13 day meat withhold. Not to be used within 13 days of calving. Milk from treated cows must not be used for food during the first 72 hours after calving.

Click here to read our PhytoMast® frequently asked questions to learn more

1 box contains 12 tubes of PhytoMast®

Boxes Price per box
1-23 boxes $72
24-35 boxes $70
36-47 boxes $68
48-95 boxes $65
96-191 boxes $62
192+ boxes Call for pricing
Quantity Price
1 - 23 $72.00
24 - 35 $70.00
36 - 47 $68.00
48 - 95 $65.00
96+ $62.00