Evidence-based cannabis information for adults 50 and older Peer-reviewed citations · Always talk to your doctor or pharmacist · No product sales

Reading Cannabis Labels — Milligrams, Percentages, Dose Math

Labels in milligrams, not percentages. How to read flower vs concentrate vs edible labels and do the dose math without a calculator.

Milligrams, Not Percentages

The single most important number on any cannabis product label is milligrams per serving. Not the strain name. Not the percentage. Not the colorful branding. Milligrams tell you exactly how much THC and CBD you are about to consume, and for a senior following an evidence-based starting dose of 1 to 2.5 mg THC, this number is the difference between a therapeutic experience and an overwhelming one.

Every regulated cannabis product label should show:

  • THC per serving — the amount in one dose (one gummy, one capsule, one dropper).
  • CBD per serving — often listed alongside THC, especially in ratio products.
  • THC per package — the total in the entire container. A package of ten 5 mg gummies contains 50 mg total — twenty times the recommended senior starting dose.

Percentages matter primarily for flower (dried bud) and concentrates — product forms that are not recommended for seniors. For tinctures, edibles, capsules, and patches, milligrams are your anchor.

Total THC: Why THCA Matters

Some labels list both "THC" and "THCA" (tetrahydrocannabinolic acid). THCA is the raw, non-psychoactive form of THC found in the living cannabis plant. When heated — through smoking, vaping, or cooking — THCA converts to THC through a process called decarboxylation.

"Total THC" accounts for this conversion. The formula is: Total THC = THC + (THCA x 0.877). For flower products, Total THC is the more accurate predictor of psychoactive potency. For properly manufactured edibles, tinctures, and capsules, the THC listed on the label should already reflect the active, decarboxylated form.

Certificates of Analysis: Trust but Verify

A certificate of analysis (COA) is a document from a third-party laboratory confirming what is actually in a cannabis product — and what is not. COAs should verify:

  • Cannabinoid content — confirming that the labeled THC and CBD amounts are accurate.
  • Pesticide screening — testing for residual agricultural chemicals.
  • Heavy metals — screening for lead, arsenic, cadmium, and mercury.
  • Residual solvents — relevant for extracts and concentrates.
  • Microbial contamination — testing for mold, yeast, and bacteria, which is particularly important for seniors whose immune function declines with age.

Most licensed dispensaries can provide COAs on request. If a product does not have third-party lab testing documentation, treat that as a reason to choose a different product.

Terpene Profiles Matter More Than Strain Names

The popular distinction between "indica" (supposedly sedating) and "sativa" (supposedly energizing) strains has no basis in peer-reviewed clinical evidence. Effects are driven by cannabinoid and terpene profiles, not plant morphology. Two products labeled "indica" may have completely different terpene compositions and produce completely different experiences.

Terpenes — the aromatic compounds responsible for cannabis's distinctive smell — significantly influence the effects of a cannabis product. Four terpenes are particularly relevant for seniors:

Myrcene

Aroma: Earthy, musky, herbal.

Effects: Promotes sedation and muscle relaxation. Concentrations above 0.5% tend to produce the heavy body sensation often called "couch-lock." Most relevant for seniors seeking sleep support.

Beta-Caryophyllene

Aroma: Spicy, peppery (also found in black pepper and cloves).

Effects: Unique among terpenes in directly binding CB2 receptors, providing anti-inflammatory effects. Particularly relevant for seniors with inflammatory conditions like arthritis.

Limonene

Aroma: Citrus, lemon, orange.

Effects: Elevates mood and reduces anxiety. A 2024 study found limonene counteracts THC-induced anxiety — making limonene-rich products a good match for seniors concerned about cannabis-related anxiety or paranoia.

Alpha-Pinene

Aroma: Pine, fresh, woody.

Effects: Supports alertness and may counteract THC-related memory impairment. A good choice for daytime use when cognitive clarity is important.

Not all product labels include terpene profiles, but they are becoming more common — especially on higher-quality products. When available, terpene information is a more reliable predictor of experience than any strain name.

A Label-Reading Checklist for Seniors

  1. Check THC per serving — is it 2.5 mg or less for a first-time user?
  2. Check CBD per serving — is there a CBD component? What is the ratio?
  3. Note THC per package — know the total to avoid accidental overconsumption.
  4. Look for "Total THC" — especially on flower products, this is the true potency number.
  5. Request the COA — verify third-party testing for potency, pesticides, and contaminants.
  6. Check terpene profile — if available, match terpenes to your goals (sleep, pain, mood).
  7. Ignore strain names — "Purple Sunset Kush" tells you nothing about what is in the product.

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