Dr. Clark Store Difference

  • At Dr. Clark Store, quality isn’t a trend—it’s our origin story.
  • Long before carrageenan made headlines, Hulda Clark insisted our capsules be carrageenan-free.
  • While many “veggie” HPMC capsules still use carrageenan as a gelling aid, ours never did.
  • Here’s the truth: HPMC (hypromellose) comes from plant cellulose but is formed using additional chemicals. Labels rarely list them—just “vegetarian capsules.”
  • Hulda chose a simpler path: gelatin capsules. Fewer processing agents. Fewer surprises.
  • Sourced and quality-controlled in North America. Because purity should be proven, not promised.

Why you should always buy from the Dr. Clark Store, and not other companies using her name

If you search for Dr. Hulda Clark’s recommended products online, you’ve probably noticed that there are a few companies with Dr. Clark’s name or likeness. This can be confusing. You may think all these companies are related and you may assume that they all sell the same quality products. And that couldn’t be further from the truth. 

Here’s how you can spot the difference when choosing your Dr. Clark products:

1) Buy from the ORIGINAL manufacturer

Dr. Clark Store remains the ORIGINAL manufacturer of Dr. Hulda Clark’s products. We started out as Self Health Resource Center (SHRC) in 1993. Founded by Dr. Clark’s son Geoff Clark, SHRC was meticulously designed to follow Dr. Clark’s strict production methods for supplements without flow agents, investing in specialized equipment to do so. Although SHRC changed names to Dr. Clark Store, we still follow Dr. Clark’s strict manufacturing and testing protocols to make the purest supplements possible.

We are the only major supplier of Dr. Clark cleanses to have never used excipients such as magnesium stearate in our products.

2) Buy the Zapper brand Dr. Clark used herself

Dr. Clark popularized a frequency device called the zapper. Because Dr. Clark generously allowed others to use her name, there are several zapper brands bearing her name. Some even feature her picture on the device as well. However, only one zapper brand was used by Dr. Clark herself. 

Made by SHRC, SyncroZap was the first branded zapper. Dr. Clark turned away from zapping with specific frequencies early on in her research because she found it problematic and less effective than other methods. She replaced frequency zapping with plate zapping. The SyncroZap zapper is 100% compliant with Dr. Clark’s research, using plate zapping technology instead of insertable frequency keys. The Dr. Clark Store, staying true to Dr. Clark’s research, only sells the SyncroZap zapper.  

3) Our walnut hull tincture is GREEN, just like Dr. Clark intended

Black walnut hull tinctures are favored for their antimicrobial properties. But not just any tincture will do. Dr. Clark knew the importance of tincture potency. That’s why she insisted on using GREEN black walnut hull tincture to support the body’s natural defenses against foreign organisms.

The green color comes from using only the young, green hulls from black walnut trees. The immature hulls have a higher juglone concentration than mature brown hulls. Juglone, the active compound from the hull, is the essence of any walnut hull tincture, making green tinctures more potent and more effective due to their higher juglone content.

We continue to follow Dr. Clark’s protocols for making only highly potent green tincture.

4) We’re the only store that sells a water filter featuring a hot water backwash designed specifically for Dr. Clark

Dr. Clark knew the importance of clean water and included it as part of her health-restoring protocols. While she favored activated charcoal filters for their effectiveness in chlorine removal, she did not like the solid block carbon filters that were prevalent on the market. The solid block construction allowed water to carve channels through the carbon, and because water likes to travel the path of least resistance, water passes through the channels with minimal filtering.

Seeing the flaws in solid block filters, Dr. Clark worked with a team of engineers to design a whole house water filter with a loose bed of activated charcoal that is routinely “washed” with hot water. With each wash cycle, the charcoal is lifted and spun to destroy any channels the water made during filtration. And the hot water allows the charcoal to release the filtered contaminants, which are removed when the backwash water drains. Each hot water backwash essentially renews the activated charcoal to maximize water filtration.

We are the only Dr. Clark company to offer this innovative water filtration system.