We must decide whether laches bars a manufacturer of nutritional supplements from suing its competitor for false advertising under the Lanham' Act when the analogous state statute of limitations period has expired.
Nutrition Now, Inc. (“Nutrition Now”) distributes PB8, a popular probiotic nutritional supplement designed to aid digestion. Since initial distribution in 1985, Nutrition Now has made three central claims. First, PB8 contains fourteen billion “good” bacteria per capsule. Second, PB8 contains eight different types of bacteria. Third, PB8 does not require refrigeration. Nutrition Now has always prominently displayed these claims on PB8’s product label. The claims also have played a central role in Nutrition Now’s marketing campaign, which totals “hundreds of thousands” of dollars per year and includes the use of national magazine advertisements.
Jarrow Formulas, Inc. (“Jarrow”) offers a competing probiotic supplement. In 1993, Nutrition Now and Jarrow participated in an industry trade show. Jarrow Rogovin, the president of Jarrow, approached Martin Rifkin, the president of Nutrition Now, at the show. Rogovin vigorously complained to Rifkin that Nutrition Now’s claims regarding PB8 were false and misleading.
A few months later, Jarrow filed a complaint with the Grievance Committee of the National Nutritional Foods Association. Jarrow alleged that Nutrition Now’s claims were “false, unfair, misleading, and illegal” and amounted to “consumer fraud.” Jarrow claimed that Insti-tut Rosell (“Rosell”), the manufacturer of its competing product, had tested PB8 and verified that the claims were false. Jarrow urged the Committee to take appropriate action, including releasing a statement declaring the claims false and misleading. 1
On the following day, Jarrow sent a letter to its customers urging them to avoid PB8. The letter explained that PB8 “has been tested, and each test has disclosed a dead, worthless product making ridiculous claims. It is a waste of money and cheats the consumer.”
A few days later, Rogovin sent a letter to Nutrition Now on behalf of Jarrow. The letter stated, “I have every intention of putting an absolute and total end to the false claims of your company regarding PB8.” Rogovin promised to send PB8 out for independent testing in order “to bury the’produet.’ ” He stated, “I have given you ... a lot of time to clean up your act. Time’s up.”
The following day, Rogovin sent a letter expressly threatening litigation. The letter stated, “I could be suing you for unfair competition already. I could also have just turned Nutrition Now in to the Federal Trade Commission (FTC) for consumer fraud.”
Undeterred, Nutrition Now continued to make its claims about PB8. Indeed, Nutrition Now kept the product label unchanged and continued to use the claims as a central part of its marketing campaign. Jarrow, despite its threat of litigation in 1993, waited until August 2000 to file suit. In its suit, Jarrow asserts that Nutrition Now’s claims are false and misleading in violation of § 43(a)(1)(B) of the Lanham Act, 15 U.S.C. § 1125(a)(1)(B). Jarrow also sued under California law for unfair competition, Cal. Bus. & Prof.Code *833 § 17200, and for false advertising, id. § 17500.
Nutrition Now moved for summary judgment on the grounds that the statutes of limitation and laches bar Jarrow’s claims. The district court held that Jar-row’s action was barred by laches, and dismissed the suit. The court declined to address the statutes of limitation question.
In this timely appeal, Jarrow claims that (1) it did not exercise unreasonable delay in filing suit, (2) Nutrition Now would not suffer prejudice if the suit were to proceed, (3) laches, even if generally applicable, does not bar its claim for prospective injunctive relief, (4) the public interest would not be served by barring suit, (5) Nutrition Now is precluded by the unclean hands doctrine from asserting laches, and (6) the district court erred in failing to continue summary judgment pending additional discovery.
II
As a threshold matter, it must be observed that we have expressed inconsistent views of the proper standard of review of the grant of summary judgment on the basis of laches. In
Jackson v. Axton, 25
F.3d 884, 888 (9th Cir.1994), we remarked, “This court has reviewed a grant of summary judgment on grounds of laches both de novo and for abuse of discretion.”
2
The court cited
Soules v. Kauaians for Nukolii Campaign Committee,
Indeed, outside the context
of
summary judgment, we have expressed further conflicting statements as to the proper standard when the district court enters judgment on the basis of laches. In some eases we have reviewed the district court’s laches determination for an abuse of discretion, while in others we have reviewed for clear error; in no eases have we conducted a de novo review. Compare, e.g.,
Telink, Inc. v. United States,
24 F.3d
42
47
&
nn. 10-11 (9th Cir.1994) (abuse of discretion),
Russell v. Price,
We disagree with
Jackson’s
dicta that any of our cases have suggested that we review the district court’s laches determination de novo.
Jackson
relied solely upon our decision in
Soules,
Contrary to
Jackson’s
suggestion,
Soules
cannot be fairly read as applying a de novo standard to the district court’s, laches determination. When a district court grants summary judgment on the basis of laches, we review certain aspects of the district court’s decision de novo. For example, we review de novo whether
*834
the district court inappropriately resolved any disputed material facts in reaching its decision.
See Kling v. Hallmark Cards Inc.,
Our decision in
Soules
is not to the contrary.
Soules
broadly stated that the district court’s grant of summary judgment on the basis of laches is reviewed de novo.
We are still left with the question of the proper standard of review of the court’s laches determination. As
Jackson
noted, we have reviewed application of laches for an abuse of discretion on summary judgment.
Ultimately, any intracircuit conflict need not be resolved in this case. The result here will not depend upon whether the abuse of discretion or the clear error standard applies.
See Danjaq, LLC v. Sony Corp.,
Ill
Jarrow contends that Nutrition Now’s claims constitute false and deceptive
*835
advertising in violation of § 43(a)(1)(B) of the Lanham Act, 15 U.S.C. § 1125(a)(1)(B).
3
Section 43(a)(1)(B) authorizes suit against persons who make false and deceptive statements in a commercial advertisement about their own or the plaintiffs product.
See Southland Sod Farms v. Stover Seed Co.,
A
“Laches is an equitable time limitation on a party’s right to bring suit,”
Boone v. Mech. Specialties Co., 609 F.2d
956, 958 (9th Cir.1979), resting on the maxim that “one who seeks the help of a court of equity must not sleep on his rights.”
Piper Aircraft, Corp.,
Laches, an equitable defense, is distinct from the statute of limitations, a creature of law.
E.g., Jackson,
While laches and the statute of limitations are distinct defenses, a laches determination is made with reference to the limitations period for the analogous action at law. If the plaintiff filed suit within the analogous limitations period, the strong presumption is that laches is inapplicable.
E.g., Shouse v. Pierce County,
559 F.2d
*836
1142, 1147 (9th Cir.1977) (“It is extremely rare for laches to be effectively invoked when a plaintiff has filed his action before limitations in an analogous action at law has run.”)- However, if suit is filed outside of the analogous limitations period, courts often have presumed that laches is applicable.
Brown v. Kayler,
1
The proper interplay between laches and the statute of limitations for Lanham Act claims is somewhat elusive.
See, e.g., Restatement (Third) of Unfair Competition
§ 31 cmt. a (discussing the uncertain role of the statute of limitations for Lanham Act claims). The Lanham Act contains no explicit statute of limitations.
E.g., Official Airline Guides, Inc. v. Churchfield Publ’ns, Inc.,
In passing, we have stated that § 43(a) borrows a state limitations period as a statute of limitations defense.
See Karl Storz Endoscopy v. Surgical Techs., Inc.,
2
`While it is uncertain whether Congress intended the statute of limitations to be a separate defense, the analogous state limitations period nonetheless plays a significant role in determining the applicability of laches. We have stated in contexts outside of the Lanham Act that the presumptive applicability of laches turns on whether the limitations period for the analogous action at law has expired. E.g., Shouse,
3
We must next determine when the analogous statute of limitations has expired for the purpose of fixing the presumption for laches. For many Lanham Act claims, the alleged violations are ongoing, i.e., the wrongful acts occurred both within and without the limitations period. E.g., Danjaq,
We hold that the presumption of laches is triggered if any part of the claimed wrongful conduct occurred beyond the limitations period. To hold otherwise would "effectively swallow the rule of lach-es, and render it a spineless defense." Danjaq,
We further hold, consistent with our precedent, that in determining the presumption for laches, the limitations period runs from the time the plaintiff knew or should have known about his § 43(a) cause of action.
General Bedding Corp.,
4
In sum, we presume that laches is not a bar to suit if the plaintiff files within the limitations period for the analogous state action; the presumption is reversed if the plaintiff files suit after the analogous limitations period has expired. For purposes of laches, the limitations period may expire even though part of the defendant’s conduct occurred within the limitations period. Further, the state limitations period runs from the time the plaintiff knew or should have known about his § 43(a) cause of action.
5
Jarrow and Nutrition Now agree that the analogous limitations period is California’s period for fraud, which is three years.
See
Cal.Civ.Proc.Code § 338(d);
Gen. Bedding Corp.,
B
As the party asserting laches, Nutrition Now must show that (1) Jarrow’s delay in filing suit was unreasonable, and (2) Nutrition Now would suffer prejudice caused by the delay if the suit were to continue.
See, e.g., Danjaq,
1
A determination of whether a party exercised unreasonable delay in filing suit consists of two steps. E.g., Danjaq,
The district court did not err in concluding that Jarrow exercised unreasonable delay in filing suit. Jarrow knew of its *839 potential cause of action in 1993, but waited until 2000 to file suit. 6 Jarrow’s seven-year delay is more than double the time available to file suit under the analogous limitations period. See Cal.Civ.Proc.Code § 338(d).
Further, Jarrow does not offer a legitimate excuse for its lengthy delay. Jarrow attributes its delay to a problem with its supplier, Rosell. Jarrow avers that it did not wish to file suit without laboratory analysis from Rosell proving Nutrition Now’s claims false. Rosell, however, had a policy of not providing laboratory analysis to be used in litigation. Jarrow promptly filed suit after Rosell changed its policy.
As the district court correctly noted, Rosell’s litigation policy did not excuse Jarrow’s delay in filing suit. Jarrow could have sought laboratory testing from another source. While Jarrow stresses that Ro-sell possessed unique expertise regarding probiotic nutritional supplements, it made no attempt to solicit an alternative tester. Jarrow undoubtedly perceived that its success in litigation would be bolstered by the submission of Rosell’s test results. Nonetheless, Rosell’s litigation policy did not justify Jarrow’s delay in filing suit. Jar-row’s delay in fifing suit was unreasonable.
2
Laches will not apply unless Nutrition Now will suffer prejudice from Jar-row’s delay if the suit were to proceed.
E.g., Shouse,
Nutrition Now has closely tied the challenged claims to PB8 since initial distribution in 1985. Nutrition Now has always prominently displayed the claims on PB8’s product label. Nutrition Now has also used the claims as a central part of its extensive marketing campaign, which totals “hundreds of thousands” of dollars per year and includes the use of national magazine advertisements.
■ At bottom, Nutrition Now has invested enormous resources in tying PB8’s identity to the challenged claims. After waiting for several years, Jarrow now seeks to compel Nutrition Now to abandon its presentation of PB8, forcing it to adopt a materially different characterization of its product. If Jarrow had filed suit sooner, Nutrition Now could have invested its resources in shaping an alternative identity for PB8 in the minds of the public.
See, e.g., Hot Wax, Inc.,
C
Jarrow argues that even if laches is otherwise applicable, it should not bar its claim for prospective injunctive relief. It has often been said that laches is generally not a bar to prospective injunctive relief.
See, e.g., Danjaq,
In this case, Nutrition Now would be prejudiced by a prospective injunction. As discussed above, Nutrition Now has made the challenged claims a central part of PB8’s identity in the minds of the public.
See, e.g., Conopco, Inc.,
D
Jarrow argues that regardless of whether Nutrition Now can show unreasonable delay and prejudice, the public's interest defeats application of laches. Because laches is an equitable remedy, laches will not apply if the public has a strong interest in having the suit proceed.
See, e.g., Maryland-National Capital Park & Planning Comm’n v. United States Postal Serv.,
Jarrow contends that Nutrition Now is duping the public into buying a worthless product. Because consumers are allegedly taking PB8 under the false impression that it will improve their health, Jarrow argues that the public has a strong interest in allowing the suit to proceed.
Jarrow correctly notes that the public has
some
interest in its suit. However, we must be careful not to define the public’s interest in such a manner as to “effectively swallow the rule of laches, and render it a spineless defense.”
Danjaq,
*841
Of course, the public has a particularly strong interest in an accurate description of health and medical products.
See, e.g., Conopco,
Jarrow vigorously asserts that PB8 lacks the potency and effectiveness of competing probiotic supplements. However, the critical question is whether consumer health will be materially affected as a consequence of taking PB8. Mindful of our deferential standard of review, we cannot conclude that Jarrow has made such a showing. Consumer health may be benefited by taking probiotic nutritional supplements. But, we cannot conclude that the failure to take an effective probiotic supplement puts consumer health in jeopardy. For example, Jarrow has not shown that probiotic supplements are akin to drugs such as heart medicine, which if ineffective, would lead to severe consequences.
Further, Nutrition Now does not promote PB8 in a manner that implicates public health concerns. Nutrition Now is not misleading consumers into departing from established medical care. For example, Nutrition Now does not urge consumers to take PB8 in lieu of prescribed medication. Nutrition Now markets PB8 as a supplement to, not a panacea for, better health.
Apart from alleging that PB8 is generally ineffective, Jarrow also claims that PB8 contains a dangerous strain of bacteria, S. faecium. However, Jarrow’s allegations regarding the effect of this strain are con-clusory, and at best, merely suggest that the strain is controversial. On this record, we cannot conclude that the district court erred. .
E
Alternatively, Jarrow argues that Nutrition Now is precluded from asserting laches because of unclean hands. A party with unclean hands may not assert laches.
E.g., Hot Wax, Inc.,
Jarrow argues that Nutrition Now acted with unclean hands because it made the challenged claims knowing they were false. In a Lanham Act false advertising suit, a plaintiff cannot ordinarily show unclean hands, and thereby defeat laches, simply by alleging that the defendant made claims knowing that they were false.
See, e.g., Hot Wax, Inc.,
Jarrow also claims that Nutrition Now is barred by unclean hands because of its conduct in defending Jarrow’s accusations in 1993. When Jarrow initially leveled its accusations about PB8, Nutrition Now retained Alpha Omega (“Alpha”), a microbiology laboratory. Alpha tested samples of PB8 and transmitted its findings to Nutrition Now. Unbeknownst to Alpha, Nutrition Now prepared a report based on the findings. Nutrition Now also created a graphic letterhead for Alpha for use on the report, without Alpha’s knowledge or permission. Nutrition Now transmitted the report to a “small number of health stores,” along with a cover letter disparaging Jarrow’s accusations.
Alpha promptly complained to Nutrition Now. Alpha charged that the report contained information that it did not verify and would not stand by. Alpha also resented the fact that Nutrition Now put Alpha’s letterhead on a report that it did not prepare. Nutrition Now promptly ceased using the report after receiving Alpha’s complaint.
Nutrition Now’s actions, while troubling, do not amount to unclean hands. The report was distributed to only a “small number” of stores. Nutrition Now promptly ceased using the report after Alpha complained. It is also significant that Jarrow was not misled by the report. Perhaps, Nutrition Now’s hands are not as “clean as snow.”
GoTo.com, Inc.,
IV
Jarrow also appeals the district court’s denial of its Rule 56(f) motion for a continuance of the summary judgment motion pending additional discovery. A Rule 56(f) motion must set forth why additional discovery is warranted and the particular facts expected to be discovered.
E.g., Mackey v. Pioneer Nat’l Bank,
V
Finally, Jarrow appeals the district court’s application of laches to its state law claims for unfair competition, Cal. Bus. & Prof.Code § 17200, and false advertising,
id. §
17500. We need not decide whether the California and federal laches standards are identical. The standards are substantially similar, and any differences would not affect the result in this case.
See, e.g., Finnie v. Town of Tiburon,
AFFIRMED.
Notes
. Ultimately, the Committee took no action.
. Jackson
later was abrogated on other grounds.
See Fogerty v. Fantasy, Inc.,
. The statute provides, in relevant part:
(1) Any person who, on or in connection with any goods or services, or any container for goods, uses in commerce any ... false or misleading representation of fact, which—
(B) in commercial advertising or promotion, misrepresents the nature, characteristics, qualities, or geographic origin of his or her or another person’s goods, services, or commercial activities, shall be liable in a civil action by any person who believes that he or she is or is likely to be damaged by such act.
§ 1125(a).
. A prima facie case requires a showing that (1) the defendant made a false statement either about the plaintiff's or its own product; (2) the statement was made in a commercial advertisement or promotion; (3) the statement actually deceived or has the tendency to deceive a substantial segment of its audience; (4) the deception is material, in that it is likely to influence the purchasing decision; (5) the defendant caused its false statement to enter interstate commerce; and (6) the plaintiff has been or is likely to be injured as a result of the false statement, either by direct diversion of sales from itself to the defendant, or by a lessening of goodwill associated with the plaintiffs product.
Southland Sod Farms,
. The equitable nature of § 43(a) is further confirmed by the fact that laches is a bar to monetary relief under the act.
E.g., Hot Wax, Inc.,
On the other hand, § 43(a) cannot be characterized as purely equitable; for example, certain trademark infringement actions trigger a Seventh Amendment right to a jury trial, which pertains to actions at law.
See Dairy Queen, Inc. v. Wood,
. Jarrow arguably should have known about its potential cause of action in 1985, when Nutrition first made the challenged claims about PB8. Ultimately, the result does not depend upon whether 1985 or 1993 is the appropriate date. Accordingly, we need not decide whether Jarrow should have known about its cause of action in 1985.
Jarrow suggests that its delay should be measured from 1999, when the FDA enacted regulations pertaining to the labeling of nutritional supplements, 21 C.F.R. §§ 101.4, 101.36. This argument is entirely without merit.
