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Cranberry Proanthocyanidins in FemiPro: What 30% PACs Can and Cannot Mean
Cranberry proanthocyanidins, or PACs, are plant compounds that standardized extracts are measured by. FemiPro's cranberry line is labeled "std. to 30% proanthocyanidin". The line weighs at most 175 mg, so it holds at most about 52 mg of PACs. Trials of cranberry looked at repeat UTIs, not bladder control.
Written by the FemiPro label deskUpdated · 4 min read
The compound01
What are cranberry proanthocyanidins?
Cranberry proanthocyanidins are a family of plant compounds found in the berry, often shortened to PACs. Makers of cranberry extracts use the PAC share as a yardstick, because it says how concentrated the extract is.
The yardstick is useful, but it is only a percentage. A label that says 30% PACs tells you the mix of the extract, not how much extract is in the capsule. You need the weight of the line to turn a percentage into milligrams.
That is the gap on the FemiPro label. It prints "std. to 30% proanthocyanidin" next to cranberry extract, then folds the extract into a blend with no single weight.
The math02
How many PACs could one FemiPro capsule hold?
One FemiPro capsule could hold at most about 52 mg of cranberry PACs. That is a ceiling worked out from the label order, not an amount the maker printed.
The herbal blend weighs 350 mg and lists four ingredients by weight, heaviest first (21 CFR 101.36, supplement labeling). Cranberry is second, so it cannot outweigh the first line, and the two together cannot pass 350 mg. That caps cranberry extract at 175 mg, which is 350 divided by 2. Thirty percent of 175 is 52.5, so about 52 mg of PACs at the very most.
The real figure could be far lower. If mimosa pudica seed extract takes most of the blend, little is left for cranberry. Nothing on the bottle rules that out.
A worked example helps. If cranberry took a quarter of the herbal blend, that is 87.5 mg of extract and about 26 mg of PACs. If it took a tenth, it is 35 mg of extract and about 10 mg of PACs. Every one of those cases fits the label.
The bars compare each line's ceiling with studied amounts. The FemiPro cranberry page covers the line in full.
The research03
Do PAC-standardized cranberry products prevent UTIs?
Cranberry products reduced repeat urinary tract infections in a large Cochrane review of 50 trials, but the review did not isolate a PAC dose. The overall risk ratio was 0.70, and 0.74 in women with recurrent infections (Cochrane 2023, cranberries for preventing UTIs).
The trials used juices, tablets and capsules of many strengths. So the result supports cranberry as a group of products, not 30% PACs at 52 mg or any other number.
The review found little or no benefit in older people in care homes, in pregnancy and in adults who do not empty the bladder fully. The 2025 American urology guideline lets clinicians offer cranberry to women with recurrent infections (AUA/CUA/SUFU, Recurrent uncomplicated UTI guideline 2025). NCCIH puts the possible drop at about 25% and says cranberry is not a treatment for an infection you already have (NCCIH, Cranberry).
None of this is about leaks. The trials counted infections, not wet pads.
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See packsReading a label04
How do you read a PAC claim on a supplement label?
Read a PAC claim by asking three questions: how much extract, how much PAC and how was it measured. A label that answers all three lets you do the math. A label that answers one leaves a gap.
| Question | On the FemiPro label? |
|---|---|
| Which cranberry part and species | Yes: Vaccinium macrocarpon, berry |
| PAC share of the extract | Yes: 30% |
| Weight of the extract | Not printed (at most 175 mg) |
| PAC test method | Not printed |
| Lab report | Not published |
Different PAC tests can give different numbers for the same extract, so a method matters. The label names none. Safety is calmer: a US Pharmacopeial review found cranberry ingredients not known to carry serious risks when used properly, with warfarin the main item to watch (Madden 2021, cranberry safety (stones, warfarin)). Keep taking any prescribed medicine, and tell your clinician about every supplement.
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FAQ05
Proanthocyanidin questions, answered
What does std. to 30% proanthocyanidin mean?
It means the extract was standardized so that about 30% of its weight is proanthocyanidins. It does not say how heavy the extract is in the capsule. FemiPro prints the percentage but no extract weight.
Are PACs the same as vitamin C in cranberry?
No. Vitamin C is a vitamin, while PACs are a separate plant compound family. FemiPro's label lists no vitamin C. Its cranberry line is described only by the PAC share.
Can you get PACs from cranberry juice?
Juice contains some PACs, but amounts vary by brand and sweetened cocktails carry added sugar. The label of a juice rarely states PACs, so comparing it with a capsule is guesswork.
Why do two cranberry capsules with 30% PACs differ?
The percentage describes the extract, not the capsule. One capsule might hold 500 mg of extract and another 100 mg, which gives five times the PACs from the same 30%.
Who wrote this06
Written and reviewed by
Pages built from the label, the sales page and linked NIH, FDA, FTC and peer-reviewed sources.
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U.S. stocking partner for FemiPro
Ready to try FemiPro?
Check your medicines first, then pick a pack. Every pack ships free in the US, six bottles cost the least per bottle, and each order carries the 60-day money-back guarantee.
- Secure checkout
- 60-day money-back guarantee
- Ships from the U.S.