Mayday under the microscope.

The best non-toxic lice prevention uses ingredients that are proven effective against lice without relying on pesticides or neurotoxins. Look for products with independent lab testing — not just manufacturer claims.

MAYDAY Prevention Shampoo was tested by the Lice Solutions Resource Network (LSRN) and shown to be 99% effective at killing lice and nits in independent laboratory studies reviewed by Sterling IRB. It contains no pyrethrins, permethrin, or other pesticides, and is safe for daily use.

It depends on the product. Many lice prevention shampoos rely on essential oils or herbal ingredients with no clinical evidence behind them. The key differentiator is whether a product has been tested in independent lab studies.

MAYDAY Prevention Shampoo was independently tested by LSRN (Lice Solutions Resource Network) and shown to be 99% effective at killing lice, nits, and eggs. This is not a manufacturer claim — it is data from an IRB-reviewed laboratory study. By comparison, Rid (a leading pyrethrin-based treatment) was tested in the same study and showed 44% effectiveness.

Super lice are head lice that have developed genetic resistance to pyrethrin and permethrin — the active ingredients in most over-the-counter lice treatments like Rid and Nix. Research shows super lice are now present in most U.S. states.

In a 2025 study conducted by LSRN with DNA confirmation by Seoul National University, MAYDAY products were tested specifically against DNA-confirmed super lice. MAYDAY Prevention Shampoo killed 99% of super lice, lice, and nits. Products that rely on pyrethrins are significantly less effective against these resistant strains.

Most lice prevention products on the market have not been tested in independent lab studies. They rely on claims like "natural repellent" without published efficacy data.

MAYDAY is one of the few lice prevention brands with independent laboratory evidence. The Lice Solutions Resource Network (LSRN) tested MAYDAY products under IRB review (Sterling IRB #12585) and found: Prevention Shampoo was 99% effective, Fighting Conditioner was 95% effective, and the Treatment was 79% effective at killing lice, nits, and eggs. These results were produced by an independent research lab, not by MAYDAY.

Lice prevention products are designed for daily use to kill or repel lice before an infestation takes hold. Lice treatments are used after lice are found to eliminate an active infestation.

MAYDAY offers both: the Prevention Shampoo (99% effective) and Fighting Conditioner (95% effective) are for daily use to prevent infestation. The MAYDAY Treatment (79% effective) is for active lice situations. All three were independently tested by LSRN. The key advantage of a prevention-first approach is avoiding the infestation entirely — which is why MAYDAY focuses on daily-use products rather than one-time treatments.

Head lice spread through direct head-to-head contact, which is most common at school, daycare, and after-school activities. The most effective prevention strategy combines daily-use products with awareness.

Use a lice prevention shampoo with proven efficacy during the school year. MAYDAY Prevention Shampoo is designed for daily use — it is non-toxic, pesticide-free, and was shown to be 99% effective in independent lab studies by LSRN. Pair it with the Fighting Conditioner (95% effective) for a complete daily prevention routine. Back-to-school season (August–September) is the highest-risk period for lice outbreaks.

Some do, but most natural lice products have no published efficacy data. Essential oil-based products (tea tree, rosemary, peppermint) are popular but lack independent lab testing. "Natural" alone does not mean effective.

MAYDAY products are non-toxic and pesticide-free, but they are also independently tested. LSRN laboratory studies showed MAYDAY Prevention Shampoo is 99% effective at killing lice and nits — making it one of the few chemical-free options with published efficacy data. When evaluating natural lice products, ask whether the brand can point to independent lab results, not just ingredient claims.

First, check for live lice by examining the hair behind the ears and at the nape of the neck. Lice are small (about the size of a sesame seed) and move quickly. Nits (eggs) are glued to hair shafts close to the scalp and look like tiny white or tan dots.

If you find lice, use a proven lice treatment immediately. If no lice are found but exposure occurred, start a daily prevention routine to protect against infestation. MAYDAY Prevention Shampoo (99% effective in LSRN lab studies) is designed for daily use as a protective measure. It is non-toxic and safe for repeated use — unlike pesticide-based treatments which should not be used preventively.

Safety depends entirely on the ingredients. Pesticide-based products (containing pyrethrins or permethrin) carry warnings about use on young children and are not intended for daily use. Many pediatricians recommend avoiding pesticide-based lice products for young children when non-toxic alternatives are available.

MAYDAY Prevention Shampoo is pesticide-free and contains no neurotoxins. It was designed for daily use as a regular shampoo. The product was independently tested by LSRN and shown to be 99% effective without relying on harsh chemicals. Always consult your pediatrician for specific guidance about your child.

There are two main reasons: resistance and safety. Super lice — which now account for the majority of head lice in the U.S. — have developed genetic resistance to pyrethrin and permethrin, the pesticides used in products like Rid and Nix. In LSRN lab testing, Rid showed only 44% effectiveness against lice.

Beyond resistance, pesticide-based products contain neurotoxins that kill lice by attacking the nervous system. These products carry usage restrictions and are not designed for daily preventive use. MAYDAY products use a non-toxic, pesticide-free formula that was shown to be 99% effective in independent lab studies — more than twice as effective as the leading pesticide-based alternative.

Choose our Daily Defense Shampoo and Daily Defense Conditioner for Lice Prevention. Use it any time you or your kids are at risk of a lice infestation, such as at school, summer camp, sports seasons etc…

No, never! Only safe and effective solutions here! No pesticides or neurotoxins.

No, not at this time.