Proprietary blends and recipes they were meant to protect

Two thousand products shared a crowded shelf by the 1990s, and a new law sorted how each label should read. That law still shapes the small panel on the back of every bottle. Its compromise on recipes explains why so much remains unreadable.

Congress counted about 600 dietary supplement manufacturers in the United States producing approximately 4,000 products in 1994, with total annual sales of at least $4,000,000,000 that year. The Dietary Supplement Health and Education Act of 1994 was signed into law on October 25, 1994. The United States supplement market exceeded $60 billion by 2025. Growth on that scale turned the definition written into the law into a daily reference point.

Under the 1994 law, a dietary supplement is a product other than tobacco intended to supplement the diet that contains a vitamin, mineral, herb or botanical, amino acid, or other dietary substance, concentrate, metabolite, constituent, extract, or combination. The nutrition label for a dietary supplement is called a Supplement Facts panel. A Supplement Facts panel must list the names and quantities of dietary ingredients present, plus Serving Size and Servings Per Container, with an exception when servings information duplicates net contents. One serving equals the maximum amount recommended on the label per eating occasion, or if none is given, 1 unit such as a tablet, capsule, packet, or teaspoonful.

Major differences for Supplement Facts include listing dietary ingredients without Daily Values, listing source of a dietary ingredient, and including the plant part for botanicals. Those details help a careful buyer follow material from origin to capsule. A perspectives paper states the 1994 law allows nonnutrient dietary ingredients to be listed as proprietary blends to protect unique formulas. For a proprietary blend, the weight of the blend and names of ingredients within the blend must be declared, but not the amounts of individual ingredients. FDA guidance says supplement labels must declare each dietary ingredient and, except for dietary ingredients that are part of a proprietary blend, provide the amount per serving.

What the panel shows and withholds

An evaluation guide says what shoppers usually can see is the blend ingredients and total blend amount per serving, and what they usually cannot see is the exact dose of each ingredient inside. The same guide says a 500 mg blend with five ingredients does not mean each ingredient is present at 500 mg. Arithmetic alone cannot divide the total with confidence. Order of listing gives sequence, not share.

The guide lists hidden-dose problems as harder dose fit judgment, harder stacking assessment across products, harder value comparison, and harder detection of thinly spread or hero-led formulas. Comparison across brands stalls when totals cover different contents. Stacking checks stall when a household shelf holds two mushroom products or two mineral products with overlapping names. Value comparison stalls when price per bottle cannot be tied to amount per ingredient. Detection of thinly spread or hero-led formulas stalls when a familiar name appears first in large type while its share stays private.

The archive pattern is consistent across adaptogen and mushroom labels from recent years. Long ingredient strings sit beside a single blend weight. Serving Size and Servings Per Container remain printed as required. Source material, lot identity, and harvest place rarely appear beside the blend line. That absence matters for provenance work because a buyer cannot link a named botanical to a grower, a part, or a preparation when only the group total is shown.

An example describes a 1,000 mg Mushroom and Botanical Blend with maitake, turmeric, ginger, and black pepper where the split among ingredients is undisclosed. The label states the blend. The shelf story names the mushrooms. The paperwork stops before the proportion. Maitake itself adds another layer of variation. A mushroom-label discussion says maitake on a label can mean whole mushroom powder, mycelium grown on grain, an extract, or a fruiting-body extract standardized for specific compounds. The same discussion cites 500 mg maitake extract standardized to 50 percent polysaccharides as communicating more than 1,000 mg mushroom complex. Milligrams alone are incomplete for extracts, since form, plant part, source material, and standardization also affect comparison.

Fill weight and encapsulation add a further check that blends often obscure. A capsule can hold only so much powder or oil. Total blend weight should square with Serving Size and unit count. Without per ingredient amounts, that check confirms only that the blend fits the capsule. It says little about which ingredient fills most of the space.

A familiar name on the front can rest on an unfamiliar amount inside.

Third party testing addresses identity, purity, or quality control but does not automatically reveal every ingredient amount. A seal can confirm that a lot was checked against one specification. It cannot reconstruct a recipe the label was never required to publish. A proprietary blend does not automatically mean a product is illegal, fake, or unsafe. Legality and clarity are separate questions, and a lawful label can still leave dose decisions unverifiable.

Where secrecy still makes sense

A blend can make strategic sense when ratios are a trade secret, for flavor systems, botanical complexes, or supporting ingredient groups, if claims are moderate and total amount is reasonable. A hybrid approach described in branding sources discloses exact amounts for hero actives while grouping supporting flavors, botanicals, or minor components in a blend. That structure keeps formula detail where choice depends on it. It keeps kitchen detail where taste depends on it.

The distinction turns on function. Flavor systems and minor botanical groups shape taste and appearance. Hero actives shape comparison and daily routine. When the hero appears inside the blend total, the buyer pays for a premium branded ingredient or a mineral or probiotic without a stated amount. When supporting flavors absorb the secrecy instead, the recipe keeps its character while the choice keeps its basis.

A transparent-label discussion says transparency is especially valued where dosage drives choice, naming sports nutrition, nootropics, minerals, probiotics, and premium branded ingredients. Daily use products sit squarely in that group. A household bottle is bought for months, taken beside other bottles, and compared by amount per serving. Hidden doses block that routine. They block comparison, stacking checks, and judgment about hero ingredients.

The evidence supports transparent per ingredient amounts as the default for daily use products. Blends remain legally permitted, but they protect flavour and formula stories more than they protect consumers. Founders who can name growers, state plant part and extract form, and print each amount give buyers the means to trace material and compare lots. Those who keep ratios private for flavor systems or minor botanical groups can say so, and can still disclose the actives that led the purchase.

What the record does not show matters here. It does not show how many current products use proprietary blends and how often blends hide very low hero doses. Follow the ingredient from capsule to origin and it does not show whether transparent amounts alone lead to better outcomes or safer total intake. When the extract moves from drying to testing it does not show what standardization level or extract form is most meaningful for each adaptogen or mushroom. As a result it does not show how retailers, practitioners, and everyday shoppers weigh secrecy against simplicity when they choose. Those gaps call for label archives, testing records, and surveys rather than assumption.

The position is plain. Keep legal room for true trade secrets in flavors and supporting complexes. Require clear per ingredient amounts where daily choice turns on dose. Every capsule traced back to the field should also be traced forward to the amount in the serving.