Of the many competitive strengths that investors typically credit Procter & Gamble (NYSE:PG) for having, marketing is one of the biggest. After all, the consumer goods titan boasts the largest advertising budget on the market, with almost $5 billion of annual spending.

There's a less well-known piece of P&G's marketing program, though, that involves simply giving away free stuff. The company has ramped up what it calls "sampling" initiatives lately -- in hopes of winning back market share. Management sees the trial programs as worthwhile investments, but that's debatable since they don't carry the type of payoff that a new ad campaign or product launch might quickly deliver.

Free diapers, razors, and detergent

Procter & Gamble sells a lot of diapers. At $9 billion of annual revenue, in fact, the franchise is easily P&G's single biggest brand.

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Image source: Procter & Gamble.

The company also gives away tons of these products. Through partnerships with hospitals around the country, it put trial versions of its Pampers baby products in the hands of 70% of new moms last year. Executives credit this massive sampling program with helping deliver strong market-share gains against Kimberly-Clark's (NYSE:KMB) Huggies brand. With its Pampers and Luvs brands, P&G now accounts for 45% of U.S. diaper share, up from 36% in 2009.

Man Shaving

Image source: Getty Images.

P&G also gave away 2 million samples of its Fusion razors in the last year. The company targets young men by providing them trial products near their 18th birthday so that, ideally, they become repeat customers.

Its market coverage has been impressive. Roughly 80% of this target demographic received a P&G-branded shaving product this year.

The grooming segment was P&G's worst performer in fiscal 2016 as the company had trouble defending market share from value-based rivals and from online-subscription shaving services like Unilever's (NYSE:UL) Dollar Shave Club. Trends are looking better at the start of fiscal 2017, though, which is giving management hope that it could soon return to above-average growth in this highly profitable segment.

Pg Tide

Image source: P&G.

Anchored by the Tide detergent brand, Procter & Gamble's fabric care division is held up by CEO David Taylor and his team as an example of the type of innovation-powered sales gains they want across the portfolio. "Fabric care results demonstrate what is possible when we deliver superior value from best-in-class performance at a modest price premium," Taylor told investors in a recent conference call.

Sampling has been a key contributor to that success. P&G boosted its trail giveaways to 17 million units last year from just 5 million in the prior year. Management's plans call for a further near-doubling of the program for the current fiscal year.

A lifetime of payoff

In a call with investors, Chief Financial Officer Jon Moeller recently explained why P&G decided to boost its trial-program spending despite the low payoff in terms of immediate investment returns. Here's how Moeller described the calculation:

A consumer will take a period of time just to use the product that you've sampled them with. And so that's not an investment endeavor that we typically see immediate returns in. That's why, unfortunately, we got into a practice of reducing net spending because it was not producing, it never produces immediate short-term results.

P&G pulled back on its trial programs a few years ago as part of its huge cost-cutting initiative. But the company's line of thought has changed and now executives think it's worth plowing cash into what looks like free giveaways.

"It's really the area of spending that should be the last that we cut," Moeller said in October, "because of its importance in building users for potentially a lifetime of consumption."

Demitrios Kalogeropoulos has no position in any stocks mentioned. The Motley Fool recommends Kimberly-Clark and Unilever. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.