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SOURCE ® "Original" and Pelleted "Original" Micronutrients (More than three decades ago SOURCE president and founder, Susan Domizi was…)
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SOURCE ® "Original" and Pelleted "Original" Micronutrients

More than three decades ago SOURCE president and founder, Susan Domizi was competing on her

Got a horse with hoof problems or trouble holding weight despite a great feed program?

Reviewed by Ann Pruitt, InfoHorse.com · Updated May 2026
SOURCE ® "Original" and Pelleted "Original" Micronutrients (More than three decades ago SOURCE president and founder, Susan Domizi was…)
SOURCE ® "Original" and Pelleted "Original" Micronutrients (More than three decades ago SOURCE president and founder, Susan Domizi was…)

What Makes Our Company Different?

More than three decades ago SOURCE president and founder, Susan Domizi was competing on her eventing horse, Hull, with hopes of being on the US Equestrian Olympic Team. "My horse [Hull] had hoof problems and couldn't maintain his body weight. He received the finest feeding program and veterinary care available. I suspected a nutrient deficiency and set out to find something to help him." She found a great deal of Norwegian and Japanese research on seaweeds that scientists and agriculturists here had been able to duplicate. In addition to using information learned while earning a degree from Columbia University in New York, she studied all available data to determine what the American studies had missed. She used this information as a starting point for developing other approaches..

By trying different kinds of seaweeds, different blends, different methods of processing and constantly analyzing the findings she came up with a finely ground, dry mixture that she put in her horse's food. Her horse began to thrive. And that was the first serving of the product that was later to become SOURCE.

SOURCE ® “Original” and Pelleted “Original” Micronutrients for Horses Is...

  • NOT a Feed


  • NOT a Protein Supplement
  • NOT a Vitamin Supplement
  • NOT a major Mineral Supplement

Many thousands of horsemen have provided adequate levels of all of the above in a sound nutritional program, yet still been baffled by horses who express signs of subclinical and clinical disorders to which they can attribute no known nutritional or disease origin. These would include the many problems associated with hoof growth, weight, coat, stamina, conception, attitude and general "bloom".

Increasing the amounts of the above does not result in improvement and indeed may compound the problems.

Thousands of these same horsemen have added SOURCE, the broad spectrum micronutrient supplement, to their horse's diets and experienced dramatic improvement.

"Original" SOURCE Formula
Source contains an extremely broad spectrum of at least 60 elements and their associated micronutrient compounds in a biologically active form. SOURCE contains small amounts of naturally occurring vitamins (14), the 14 currently recognized "essential trace elements", the 21 trace elements now under special consideration with respect to essentiality, plus other unidentified associative factors whose role in nutrition has not yet been established.

SOURCE "Nuggets"
Source Nuggetsconsists of a daily serving of the original SOURCE micronutrients (the concentrated powder) plus all-natural ingredients added to protect our micronutrients during the pelletizing process. They taste so good that you can mix them with feed as usual, or they can even be hand fed. This is especially convenient if you are feeding only pelleted feed, or where the horse is on pasture, or on a restricted diet where he is receiving little or no concentrate feed. Source Nuggets contain the same nutrient power as the original Source, but in a convenient pellet form.

Feeding Instructions

Provide good quality hay and grain, with protein and carbohydrate levels appropriate for the age and demands of the horse; a balanced calcium / phosphorus ratio, an effective parasite control program, fresh water at all times, free access to salt, a good dental care program and feed one heaping measure of SOURCE Original per 1,000 lbs. of body weight (1/2 oz. daily) - use the measuring scoop included in the container. Feed Source Original everyday, including race and competition days for all classes and ages of horses. Average 15.2 hh horse = 1,000 lbs.

The SOURCE Guarantee

We want every person to have the opportunity to see for themselves the effectiveness of the Source micronutrients found in all of our products. If you are not satisfied with any of the products for any reason, your money will be refunded in full - no strings attached. (Simply enclose proof of purchase.)

What Horse Owners Say About SOURCE?

Says America's Most Trusted Horseman John Lyons…
" Susan, Thank you for Source. Our horses have better coats, improved weights, and better hoof walls. Wherever I travel, horsemen share their stories with me about how Source has helped their own horses. Thank you for helping bring quality products at reasonable prices to horses everywhere."
-John and Jody Lyons & all of our horses"

Says Ann Pruitt- Director at InfoHorse.com

"Source is one supplement my horses will Never do without! When my horses are on SOURCE they improve in temperament, coat, hooves, and over all well being. Everyone I recommend SOURCE to, loves it too. This is the ONE supplement that Every horse can benefit from!"

Order SOURCE Today!

Source actually Does what it says it will do!SOURCE products are widely available at your local feed and tack stores, through online catalogs or web stores, or directly from SOURCE-- just visit our Shop area at 4Source.com for a complete listing.



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The Solution Section (FAQ)
What is SOURCE ® and what does it do for horses?
SOURCE ® is a broad-spectrum micronutrient supplement made from seaweed for horses. It is not a feed, protein, vitamin, or major mineral supplement; instead it supplies the trace micronutrients a sound feeding program can still miss. Horse owners report improvements in hoof growth, weight, coat, stamina, conception, attitude, and overall bloom.
What is in SOURCE ® "Original" micronutrients?
The "Original" SOURCE ® formula contains an extremely broad spectrum of at least 60 elements and their associated micronutrient compounds in a biologically active form. That includes small amounts of 14 naturally occurring vitamins, the 14 currently recognized essential trace elements, and 21 more trace elements under study for essentiality. It comes from seaweed and is fed as a finely ground, concentrated dry powder.
Why won't adding more feed, vitamins, or minerals fix coat, hoof, and weight problems?
Many horsemen provide adequate protein, vitamins, and major minerals yet still see subclinical issues with hoof growth, weight, coat, stamina, and attitude that have no clear nutritional or disease cause. Increasing those same nutrients often does not help and may even compound the problem. SOURCE ® instead targets the trace micronutrients that a conventional program can overlook.
What's the difference between SOURCE ® "Original" and SOURCE ® "Nuggets"?
SOURCE ® "Original" is the concentrated micronutrient powder you mix into feed. SOURCE ® "Nuggets" deliver that same nutrient power in a convenient pellet, with all-natural ingredients added to protect the micronutrients during pelletizing. Nuggets taste good enough to hand-feed and are especially handy for horses on pelleted feed, on pasture, or on a restricted diet with little or no concentrate.
How much SOURCE ® do you feed a horse?
Feed one heaping measure of SOURCE ® Original per 1,000 lbs of body weight, which is about 1/2 oz daily, using the measuring scoop included in the container. An average 15.2 hh horse weighs roughly 1,000 lbs. SOURCE ® is fed every day, including race and competition days, for all classes and ages of horses, alongside good-quality hay and grain, fresh water, free-choice salt, and sound parasite and dental care.
Is there a guarantee if SOURCE ® doesn't work for my horse?
Yes. SOURCE ® wants every owner to see the micronutrients work for themselves, so the products carry a full money-back guarantee. If you are not satisfied with any product for any reason, your money is refunded in full with no strings attached; simply enclose proof of purchase.
Who makes SOURCE ® and what's the company's background?
SOURCE ® was founded by president Susan Domizi, who began developing it more than three decades ago when her eventing horse Hull had hoof problems and couldn't hold weight despite top feed and veterinary care. Drawing on Norwegian and Japanese seaweed research and her Columbia University background, she created the original finely ground seaweed mixture that became SOURCE ®.
How can I buy SOURCE ® or learn more?
SOURCE ® products are widely available at local feed and tack stores, through online catalogs and web stores, or directly from SOURCE ®. You can call 800-232-2365, email info@4source.com, or visit www.4source.com to view the full product listing and shop.

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Ann Pruitt
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