Biofreeze has three times the menthol.

What each one is registered to do

Both are over-the-counter topical analgesics in the United States, and both name menthol as the active ingredient. They are not registered for the same claim, and neither is registered for carnosine.

The menthol argument, settled the only way it can be

The standing objection to carnosine gel is that the menthol does everything. It is a fair objection. Menthol on skin has a real, measured effect. Sixteen studies covering 191 participants put it at g = 0.27. Mostly in endurance, and mostly through perceived cooling rather than anything physiological.

Here is the part people skip. Biofreeze contains about three times the menthol of LactiGo. If the tingle is the mechanism, the cheaper product should produce the larger effect. Nobody selling either one wants to run that comparison.

What has been run is the 2025 trial, which took the menthol out of the argument instead. The placebo was ultrasound gel spiked with menthol to match the real product. Both bottles smelled and tingled the same. Seven world-class rugby sevens players did twelve maximal sprints on each. Peak power was still higher on the carnosine arm in sprints 2, 4 and 7. Four of the seven finished thinking the placebo day had been their better one.

They are good at different jobs

• A sore back, a stiff neck, an old knee: Biofreeze. That is its registered indication, it is a quarter of the price, and carnosine gel has never been tested for any of it.
• Repeated near-maximal efforts where you fade late: LactiGo, on four small trials, one of which found nothing.
• You want something before training and something else after: they are not alternatives for the same moment. The gel goes on 45 minutes before; Biofreeze is for when it already hurts.
• Cost matters and you are unsure: start with the menthol rub. If the cooling is all you were ever getting, you will have found that out for $12 instead of $55.
• Skin that reacts to menthol: Biofreeze at 4% is the harsher of the two, and LactiGo sells a menthol-free version. Neither goes on broken or irritated skin.

Use one at a time

Stacking two menthol analgesics puts you past the concentration either label was written for. Same patch of skin, no evidence behind the combination. Both labels carry the same warnings: external use only, not on damaged skin, not under a heating pad, and stop if you get redness, severe burning, swelling or blistering.

Both also permit use from age two and cap application at three to four times daily. If you are applying more often than that because it stopped working, that is a signal to stop, not to reapply.