How to read a supplement facts label: Machismo Plus guide showing serving size, ingredient list, and daily values on a dietary supplement bottle

How to Read a Sexual Wellness Supplement Label

By Greg Berryman, founder of Machismo Plus. Published: 26 January 2026. How we review.

Last reviewed: 5 May 2026.

Most sexual wellness supplements rely on the front of the bottle doing the selling. The back label tells you what is in the bottle. Three numbers separate a real formula from an underdosed one: serving size, individual ingredient weight, and ingredient form. This guide covers what each of those means, what to ignore on the front of the package, and how to walk away from a product that fails the basic checks.

Why Read the Supplement Label First?

Branding and formulation are not the same thing. A product can look premium, carry a clinical-sounding name, and still be weak. The front label is written to sell. The back label, the Supplement Facts panel, is what the manufacturer is legally required to disclose.

  • Brand claims are easy to copy. Anyone can call a product "advanced" or "premium."
  • Doses and ingredient forms are harder to fake. They are listed in milligrams and are verifiable against published research.
  • The label is the only place to compare two products objectively. Marketing copy varies. The Supplement Facts panel uses the same format across every product on the market.

How to Read a Supplement Facts Panel

Serving Size and Servings Per Container

Start here. The serving size tells you how many capsules or tablets you must take to get the listed amounts. If the serving size is 4 capsules and the bottle contains 60 capsules, the bottle is 15 days, not 60.

This matters for cost comparisons. A $40 bottle of 60 capsules at 4 capsules per day is $2.66 per day. A $50 bottle of 60 capsules at 1 capsule per day is $0.83 per day. The cheaper-looking product is more than three times the cost.

Compare supplements by cost per day, not cost per bottle.

Daily Values and Missing Percentages

Vitamins and minerals show a percent Daily Value (%DV) on the panel. Many herbal extracts and amino acids do not, because no Daily Value has been established for them. A missing %DV is not a red flag on its own. It is normal for botanical ingredients.

Per Serving vs Per Capsule

Every milligram on the panel is listed per serving, not per capsule. If a label lists 1,000 mg of L-Arginine per serving and the serving size is 4 capsules, each capsule contains 250 mg. Take half the serving, get half the dose.

This is the most common point of confusion when comparing two products. A formula listing 600 mg per serving may have a higher per-capsule dose than one listing 1,200 mg per serving, depending on the serving size of each.

Supplement Label Checklist

Label Item What to Check Why It Matters
Serving size Capsules per serving, servings per bottle Determines real cost per day and real dosing
Proprietary blend Are individual ingredient weights listed or hidden? Hidden weights often mean underdosing
Ingredient form Standardized extract vs raw powder Form often matters as much as the milligrams
Other ingredients Fillers, coatings, sweeteners, colors Helps spot junk-heavy formulas

What Is a Proprietary Blend on a Supplement Label?

A proprietary blend groups multiple ingredients under one name and lists only the total weight, not the weight of each individual ingredient. The format is legal. It is also the most common way underdosing gets hidden in plain sight.

If a blend weighs 1,000 mg and lists 6 ingredients, you have no way to know whether the lead ingredient is 900 mg and the other five are trace amounts, or whether everything is underdosed. The label legally tells you nothing more than the total.

When a proprietary blend deserves skepticism:

  • Very small total blend weight with many ingredients. A 300 mg blend of 8 ingredients cannot deliver effective doses of more than one or two of them.
  • Buzzword blend names without disclosed weights. "Performance Matrix" and "Virility Complex" are marketing wrappers, not formulations.
  • Key ingredients listed but impossible to dose effectively inside the blend. If the blend is 500 mg total and one of the named ingredients is L-Arginine, the L-Arginine cannot be at the 1,500 to 6,000 mg per day range used in research.

For a breakdown of common ingredients used in this category and what doses the underlying research uses, see Sexual Wellness Ingredients: Evidence, Safety, Risks.

How Ingredient Order Reveals Underdosing

Ingredients are listed in descending order by weight. The first ingredient usually makes up most of the formula. If the lead ingredient is a cheap filler or a vague herb powder, the rest of the formula is doing less than the marketing suggests.

Token doses are the inverse problem. A formula includes a trendy ingredient at a tiny amount just so the marketing can name it on the front of the bottle. If the ingredient appears at the end of a long list, in milligrams that fall well below research doses, it is there for the front of the package, not the formula.

This is where ingredient form matters as much as weight. Standardized extracts deliver a known concentration of the active compound. Raw powder does not. The NIH Office of Dietary Supplements notes that the word "standardized" on a supplement label is not legally regulated and can mean different things across manufacturers, which is why the supporting paperwork (a published standardisation percentage, like Korean Red Ginseng standardised to 14% ginsenosides) carries more weight than the word itself.

For example, VigRX Plus lists Korean Red Ginseng standardised to ginsenosides and Hawthorn Berry standardised to flavonoids on its panel, with each weight disclosed individually rather than buried in a blend. Other formulas in the catalog are evaluated against the same standard.

Which Supplement Label Claims Should You Ignore?

Phrases that look like quality signals but legally mean nothing:

  • "Clinically proven" without a citation to a study on the finished product. Ingredient-level studies do not justify a product-level claim.
  • "Doctor recommended" with no named, credentialed professional. The phrase requires no specific endorsement to use.
  • "Maximum strength" or "extra strength" with no comparison standard. Maximum compared to what?
  • Instant or guaranteed results language. No supplement legally claims to treat or cure a condition. The standard dietary supplement disclaimer (the one starting with "These statements have not been evaluated by the FDA") is on every legitimate label for this reason.

What a Supplement Label Cannot Tell You

Even a well-disclosed label has limits. A formula that looks strong on paper may not work for a specific person, for reasons the panel cannot show:

  • Absorption differences. Two products with the same milligrams of the same ingredient can deliver different amounts to the bloodstream depending on form, capsule design, and what is taken with the supplement.
  • Individual responsiveness. Body weight, baseline nutrient status, age, and genetic factors all affect how a supplement performs.
  • Interactions. Medications, alcohol, sleep deprivation, and chronic stress can mute the effect of even a well-dosed formula.

For broader context on what supplements can and cannot do, see How Sexual Wellness Supplements Work. For government sources on supplement safety and quality:

How to Choose a Supplement That Matches Your Goal

A circulation-focused formula will not fix a stress-driven problem. A hormone-related formula may do little if hormone levels are normal. Before buying, you need a basic hypothesis about what is limiting things.

Sexual wellness supplements generally fall into three buckets:

  • Blood flow support. Nitric oxide pathway ingredients (L-Arginine, L-Citrulline, Pycnogenol) and traditional circulatory herbs (Ginkgo, Hawthorn).
  • Stress and nervous system support. Adaptogens (Ashwagandha, Rhodiola) for stress response and sleep quality.
  • Hormone-related nutrients. Zinc, magnesium, vitamin D, and DHEA, which matter most when baseline levels are low.

A formula that bundles all three in small amounts is rarely as effective as a focused formula targeting the actual problem.

Red Flags on a Supplement Label

  • Serving size that empties the bottle in a week or two. The cost per day is almost always uncompetitive once you do the math.
  • A formula built around a proprietary blend with no individual ingredient weights disclosed.
  • Long ingredient lists with small total weights and no clear primary mechanism. Shotgun formulas underdose everything.
  • "Clinically proven" or "doctor recommended" on the front of the bottle with no citation or credentialed name.

Frequently Asked Questions

What is a proprietary blend on a supplement label?

A proprietary blend lists multiple ingredients under a single name with one combined weight. The individual ingredient weights are not disclosed. The format is legal but it makes it impossible to verify whether each ingredient is dosed at a level the underlying research uses. Many underdosed formulas use this format to hide the math.

How do I know if a supplement is underdosed?

Compare the per-serving milligrams on the panel against the doses used in published research for that ingredient. If the formula uses a proprietary blend with no individual weights, treat that as a flag rather than confirmation. Standardized extract percentages (e.g. "Korean Red Ginseng standardized to 14% ginsenosides") usually indicate a stronger ingredient form than raw powder at the same milligrams.

What does "standardized to X%" mean on a supplement label?

It indicates the percentage of the active compound in the extract. Korean Red Ginseng standardised to 14% ginsenosides means 14 percent of the extract weight is the active compound studied for effect. The word "standardized" alone is not regulated, so the percentage and the named compound are what matter.

Are proprietary blends always bad?

No. A proprietary blend with three or four ingredients and a substantial total weight (1,500 mg+) can still deliver effective doses, especially if the manufacturer has published per-ingredient amounts elsewhere. The format becomes a problem when the total weight is small, the ingredient list is long, or no per-ingredient information exists anywhere.

What does %DV mean on a supplement label?

Percent Daily Value. It compares the amount in one serving to the recommended daily intake established for that nutrient. %DV exists for most vitamins and minerals. It does not exist for herbal extracts, amino acids, or specialty ingredients, which is why the column is often blank on sexual wellness supplements.

Why does serving size matter so much?

Because every milligram on the panel is per serving, not per capsule. A formula listing 1,000 mg L-Arginine at 4 capsules per serving is 250 mg per capsule. The same formula at 2 capsules per serving would be 500 mg per capsule. Two products can list the same per-serving amount and deliver very different per-capsule doses.

What are "other ingredients" on a supplement label?

Fillers, capsule coatings, flow agents, sweeteners, colors, and preservatives. They are required to be listed but do not contribute to the effect. A short, clean "other ingredients" line is generally better than a long one full of artificial colors and sweeteners.

Does "FDA approved" mean a supplement is safe?

No. The FDA does not approve dietary supplements before they reach the market. The FDA regulates supplements under DSHEA, which requires manufacturers to ensure safety and label accuracy, but does not require pre-market approval. A label claiming "FDA approved" is misleading.

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Medical disclaimer: Machismo Plus is a consumer-research platform, not a medical provider. Content on this page is for informational purposes only and does not constitute medical advice. Consult a qualified healthcare provider before starting any supplement, particularly if you have existing medical conditions or take prescription medication. Full disclaimer: Medical Disclaimer.

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