The best natural lube, judged by numbers, not by the word.

The best natural lube is Good Clean Love Almost Naked: organic aloe base, 240 to 269 mOsm/kg, pH 4.7, no glycerin, no fragrance. The word natural on a label guarantees none of that. The five others here earn a spot the same way, with published numbers inside the WHO band, not with a leaf on the box.

What natural means on a lube label.

Nothing, legally. In the United States there is no regulated definition of natural for a lubricant, which the FDA treats as a medical device, or for a cosmetic. Any brand can print it. Organic is a little better, because a certification body can stand behind it, but organic describes where the ingredients came from, not what they do to your tissue.

What people usually mean when they search for a natural lube is a short list of wants: no glycerin, no parabens, no fragrance, no petroleum, no propylene glycol, and a plant base like aloe or oil instead of a chemistry set. That is a reasonable list. It is also most of what produces a good osmolality number. So the instinct is right. The label is just the wrong place to check it.

The two numbers that count.

Osmolality is how concentrated a lube is compared with your own tissue. Vaginal secretions sit around 260 to 290 mOsm/kg. The WHO says a lubricant should ideally measure 380 or under and never over 1,200. Glycerin and propylene glycol are what push it high, which is why a glycerin free plant formula usually scores well. The full explanation is in lube osmolality explained.

pH is acidity. A healthy vagina runs 3.8 to 4.5, and the WHO puts a vaginal lube's target at about 4.5.

Oils have neither number. They contain no water, so osmolality and pH do not apply. That makes them gentle in one way and a condom problem in another.

How we ranked these.

Published numbers first, from FDA 510(k) filings or the Dezzutti and the Edwards and Panay lab work. Then ingredient list. Then feel. A product with a plant on the label and no published data does not make the list.

Rank	Product	Type	Osmolality (mOsm/kg)	pH
1	Good Clean Love Almost Naked	Water, aloe	240 to 269	4.7
2	Sliquid Organics Natural	Water, aloe	106	4.0 to 4.4
3	Coconu Water Based	Water, aloe	42 to 46	4.0 to 5.0
4	Hallelubeyah Organic Aloe	Water, aloe	50 to 180	4.0 to 5.0
5	YES VM	Moisturizer	250	4.15
6	Coconu Oil Based	Oil	Not applicable	Not applicable

1. Good Clean Love Almost Naked. Organic aloe, iso-osmolar, pH in range, and one of two products in the Dezzutti study that caused no measurable tissue damage. It is also the easiest to find, which matters when the alternative is a bottle of something unmeasured from the same shelf.

2. Sliquid Organics Natural. Organic aloe base, 106 mOsm/kg, pH 4.0 to 4.4. The other product that passed Dezzutti clean. Thinner than Almost Naked. If you want the lowest osmolality from a brand you can find in a store, this is it.

3. Coconu Water Based. The lowest osmolality on our whole index at 42 to 46. Organic, mostly aloe, with a faint coconut note. Light and almost watery, which some people love and some find too thin.

4. Hallelubeyah Organic Aloe. A small brand with strong numbers, 50 to 180 mOsm/kg, pH 4.0 to 5.0. Mostly aloe, organic, hard to find in stores, easy online.

5. YES VM. Not a lube. YES VM is an organic vaginal moisturizer, used every two to three days rather than during sex, and it has the best numbers of any moisturizer on our index: 250 mOsm/kg and pH 4.15. It is here because people searching for a natural lube are often dealing with daily dryness, and a moisturizer does more for that than any lube. See vaginal moisturizer vs lube.

6. Coconu Oil Based. A food grade oil blend, organic, long lasting, and a decent external moisturizer. No osmolality because there is no water. Never with latex or polyisoprene condoms, which is why it sits last.

Natural oils and the condom problem.

Coconut oil, olive oil, almond oil and blends like Coconu Oil Based are the most natural lubes there are. They are also the category the WHO advisory names as highly damaging to latex. Polyisoprene condoms are just as vulnerable. Only polyurethane and nitrile condoms tolerate oil.

Oils also stay. Water based lube clears with your body's own fluids within hours. Oil does not, and a minority of people get irritation or a yeast flare from it. If condoms are not in the picture and you have never had trouble with infections, oil is a fine choice. Otherwise stay water based. The details are in lube and condoms and can you use coconut oil as lube.

When a natural lube still stings.

Plant does not mean inert. Aloe is a known contact allergen for some people. Essential oils and botanical extracts, which show up in a lot of natural branded products, are among the most common skin irritants in cosmetics. Flavors and scents are the same problem with a nicer name.

If a lube stings, stop, whatever the label says. Try a product with a shorter ingredient list. If burning, pain, bleeding or recurring infections continue after you switch, see a clinician. Dryness and pain have causes, and a lube does not treat them.

Natural things from the kitchen.

Coconut oil, olive oil and aloe straight from the plant all get asked about, and we answer each one in Basics. The short version: coconut and olive oil work and break condoms. Aloe from the plant is close to a real lube but thin and short lived, and store bought aloe gel usually contains alcohol or fragrance. A purpose made aloe lube is the same idea with a published number attached.