Updated October 2, 2026
Hygroscopic ingredients absorb moisture from the surrounding air, and that moisture degrades them and reduces potency. Three manufacturing choices protect them: compressing the ingredient into a tablet rather than a capsule, applying an enteric coating, and packaging the finished tablets in foil. All three depend on production in a humidity-controlled, cGMP-certified facility.
What "Hygroscopic" Means in Supplement Manufacturing
A hygroscopic ingredient draws water vapor out of the air. In a supplement, that moisture can start chemical breakdown, cause clumping during production, and lower the amount of intact ingredient in each serving over the product's shelf life. Because of this, a manufacturer's ability to control moisture at every stage determines whether a hygroscopic formula holds its label claim through expiration.
Contract manufacturers that offer hygroscopic production capabilities demonstrate a serious commitment to the craft and customers.
SAMe is the Clearest Example of the Challenge
SAMe (S-adenosyl-L-methionine) is one of the most established dietary supplement ingredients in the United States. It is also one of the most difficult to manufacture. Giulio Cantoni identified it in 1952 as a naturally-occuring molecule that forms from the amino acid methionine and ATP. SAMe serves as the body's primary methyl donor in making neurotransmitters, phospholipids and proteins. In other words, it's pretty much in the middle of everything important going on in your body right now.
Once researchers determined how to manufacture the compound, SAMe became an early "super-star" dietary supplement. As a supplement, SAMe supports healthy mood, joint comfort and liver function.
So if SAMe is such a rock star, why aren't more companies manufacturing it? As with so many things, the "devil is in the details." SAMe is unstable in raw form and highly hygroscopic, and even its stabilized salt forms remain moisture-sensitive. For this reason, fewer manufacturers produce it and it can be expensive to manufacture.
Contact with moisture causes materials like SAMe to degrade and become unstable. Therefore, the capability of your contract manufacturer to properly handle, manufacture, and package hygroscopic compounds is vital to the stability and effectiveness of the product.
3 Keys to Hygroscopic Stability
- Compress the ingredient into tablets, not capsules
Tablets protect hygroscopic ingredients better than capsules do. Capsule shells, gelatin especially, carry their own moisture content, which can migrate into the fill. A compressed tablet has a dense core with less exposed surface area, and it can be coated. Coating is the second layer of protection. - Apply an enteric coating
An enteric coating places a barrier between the tablet core and ambient humidity. Its main job is to carry the tablet intact through the stomach so it can release in the intestinal tract. For hygroscopic ingredients, the coating also limits how much moisture reaches the core during storage. That barrier works best when the packaging keeps humidity out as well. - Think Foil Blister Packaging
Foil packaging gives the strongest protection against moisture and air. Plastic blister films and standard bottles let small amounts of water vapor pass through over time. Foil blister packs seal each tablet individually, so opening one dose does not expose the rest. When bottles are required, induction seals and desiccants reduce exposure.
The Manufacturing Environment Ties it All Together
Your manufacturer is also your partner. When you grow, they grow. If you have a hygroscopic compound, look for a contract manufacturer that operates an FDA-registered cGMP facility, holds third-party certification such as NSF cGMP, and controls humidity through blending, compression, coating and packaging. Vesta Nutra specializes in manufacturing and packaging moisture-sensitive formulas, including SAMe.
If you have a tricky manufacturing challenge, or have discovered your current contract manufacturer is not up to the task, contact Vesta Nutra for contract manufacturing at 888-55-VESTA or via email at marketing@vestanutra.com.
Frequently Asked Questions
What is a hygroscopic ingredient?
A hygroscopic ingredient absorbs moisture from the air. In supplements, that moisture can degrade the ingredient and reduce its potency over the product's shelf life.
Are tablets or capsules better for hygroscopic ingredients?
Tablets are generally better. Capsule shells hold moisture that can migrate into the fill. Tablets have a denser core and can be enteric- or film-coated for added protection.
What packaging protects moisture-sensitive supplements best?
Foil blister packs give the strongest protection because each tablet is sealed individually against moisture and air. Bottles with induction seals and desiccants are a common alternative.
Why is SAMe hard to manufacture?
SAMe is unstable in raw form and highly hygroscopic. Keeping it potent requires humidity-controlled production, tablet format, protective coating and moisture-barrier packaging.
