Helping Horse Owners Make Informed Decisions
SOURCE ® “Original” and Pelleted “Original” — Health (Legendary ocean micronutrients for every class of horse, since 1975)

SOURCE ® “Original” and Pelleted “Original”

Legendary ocean micronutrients for every class of horse, since 1975.

Got a hard keeper or aging horse who needs three-decades-proven micronutrient support?

Reviewed by Ann Pruitt, InfoHorse.com · Updated May 2026
SOURCE Original dry meal micronutrient buckets with a scoop of seaweed powder
SOURCE Original dry meal micronutrient buckets with a scoop of seaweed powder

Every horse owner knows the look of a horse that is merely getting by versus one that is truly thriving — the deep coat sheen, the dense hoof wall, the easy weight that holds even through hard training. SOURCE ® "Original" and Pelleted "Original" are built to close the gap between those two horses. This is the flagship micronutrient supplement from SOURCE, INC., concentrated from pure dehydrated North Atlantic seaweed meals and nothing else.

Pelleted Original SOURCE Nuggets buckets with a scoop of tasty seaweed pellets
Pelleted Original SOURCE Nuggets buckets with a scoop of tasty seaweed pellets

A single half-ounce measure carries at least 60 elements and their associated micronutrient compounds in a biologically active form — the trace minerals, naturally occurring vitamins and other nutritive factors that even excellent feeding programs can leave short. Fed daily, it works quietly across the whole horse: the hooves, the coat, the condition and the breeding shed.

Why do so many well-fed horses still come up short on micronutrients?

The answer starts in the dirt. Decades of intensive farming have steadily depleted micronutrients from agricultural soils, which means even today's finest hays and feeds can be quietly deficient in the trace elements horses need to use the rest of their ration. Without those micronutrients, expensive grain is only partly utilized — a good deal of its value ends up on the manure pile rather than in the horse.

The ocean tells a different story. The sea is nature's richest storehouse of micronutrients, and certain marine plants — unlike crops grown on depleted land — contain the broadest spectrum of trace minerals and bioactive micronutrients of any plants on earth. SOURCE selects those extraordinary seaweeds, then harvests and processes them to preserve maximum bioactivity. The result is a broad-spectrum supplement that fills the gaps a grain-and-hay diet leaves behind, so the rest of the feed can finally do its job.

Concentrated 30 lb pail of SOURCE Original dry meal seaweed micronutrient supplement
Concentrated 30 lb pail of SOURCE Original dry meal seaweed micronutrient supplement

What changes will you actually see in your horse?

Horsemen who have relied on SOURC E since 1975 report the same pattern of results. Hoof growth becomes rapid with a resilient, tougher texture — though because it takes nearly a year to grow an entirely new hoof, the change is usually visible at the second or third trimming. The coat shifts first: hair texture turns soft and glistens with intense color and sheen. Good weight and condition hold even under the stress of competition, hard keepers fill out, and many horses get more out of less feed.

The benefits reach the breeding shed as well, where strong conception rates and healthy foals that reach maturity are part of the same picture of all-around bloom. The earliest sign often shows up within days or weeks as a simple reduction in undigested matter passing through — a quiet signal that the horse is finally extracting more from everything it eats.

Powder or pellet — which Original is right for your horse?

The original powder, SOURCE "Original" Dry Meal Formula, mixes easily into a daily feeding at one heaping half-ounce measure per 1,000 lbs of body weight, with the measuring scoop included. It is remarkably economical — only pennies a day, with a 5 lb container lasting an average horse about five months. SOURCE does not recommend feeding seaweed free choice, because iodine content varies between species and individual taste can lead to overconsumption; the daily measured dose is the safe, proven way to feed it.

Pelleted "Original" — sold as SOURCE Nuggets — delivers the same time-tested broad-spectrum micronutrients in a convenient, palatable pellet that took years to perfect without degrading the bioactive ingredients. The nuggets are made to taste good enough to hand-feed, which makes them ideal for picky eaters, horses on pellet-only rations and horses kept mainly on pasture. Whichever form you choose, SOURCE contains no fillers, binders, preservatives, artificial flavorings, colorings or GMO ingredients — just clean ocean nutrition.

Sealed SOURCE Original micronutrient supplement containers in two package sizes
Sealed SOURCE Original micronutrient supplement containers in two package sizes
Share This Solution
The Solution Section (FAQ)
What is SOURCE Original made from?

SOURCE "Original" is made from pure dehydrated North Atlantic seaweed meals and nothing else. A daily half-ounce measure provides at least 60 elements and their associated micronutrient compounds — trace minerals, naturally occurring vitamins and other nutritive factors — in a biologically active form, with no fillers, binders, preservatives, artificial flavorings, colorings or GMO ingredients.

How much SOURCE do I feed, and how long does a container last?

Feed one heaping measure (about a half ounce) of the Original powder daily per 1,000 lbs of body weight, mixed into one feeding; a measuring scoop is included. It costs only pennies a day, and a 5 lb container lasts an average 1,000 lb horse roughly five months. Feed it every day, including race and competition days.

How soon will I see results from SOURCE Original?

Results vary by horse, but the first sign is often a reduction in undigested matter within days or weeks. Coat sheen and condition typically improve over the following weeks, while hoof changes usually become visible at the second or third trimming, since it takes nearly a year to grow out an entirely new hoof.

What is the difference between SOURCE Original and Pelleted Original (Nuggets)?

Both forms deliver the identical broad-spectrum seaweed micronutrients. The Original is a dry meal powder that mixes into feed. Pelleted Original, sold as SOURCE Nuggets, is the same nutrition in a palatable pellet that can be mixed with feed or hand-fed — ideal for picky eaters, pellet-only rations and horses kept mainly on pasture.

Why do well-fed horses still need a micronutrient supplement?

Decades of intensive farming have depleted micronutrients from agricultural soils, so even excellent hay and feed can be deficient in the trace elements horses need to fully use their ration. Marine plants are nature's richest storehouse of these micronutrients, which is why SOURCE draws them from carefully selected ocean seaweeds rather than from depleted land.

Can I feed SOURCE seaweed free choice?

No. SOURCE does not recommend feeding kelp or other seaweeds free choice, because iodine content varies between seaweed species and individual taste preferences can lead a horse to overconsume. The proven, safe approach is the measured daily dose, which delivers a controlled, consistent level of iodine and the full micronutrient spectrum.

Is SOURCE suitable for breeding stock and foals?

Yes. SOURCE supports strong conception rates and healthy foals that reach maturity. For young stock, it is typically introduced through the mare from the time of conception, increased as feed intake rises, and continued at the mature daily amount once the foal is weaned. As with any supplement, consult your veterinarian about your individual horse's needs.

Who makes SOURCE and how long have they been doing it?

SOURCE, INC. of North Branford, Connecticut, was founded in 1975 by Susan Domizi after a seaweed-based blend transformed her own eventing horse's hooves and condition. The company is the pioneer in equine micronutrient supplementation, was the first horse supplement to offer a no-questions-asked money-back guarantee, and is a founding member of the NASC, certified to display the NASC Quality Seal.

Contact SOURCE ® “Original” and Pelleted “Original”

Call Website Email
Ann Pruitt
Contact Ann Pruitt
InfoHorse.com