Hua Da Trading, Inc.
FDA issued a warning letter to Hua Da Trading, Inc. (Brooklyn, NY, United States) on Dec 20, 2023, citing 21 CFR 201.5 and 21 CFR 201.100. Subject: Finished Pharmaceuticals, Unapproved New Drug, Misbranded.
From the letter: “Your “WeFun” product is a drug as defined by section 201(g)(1) of the FD&C Act 21, U.S.C. 321(g)(1) because it is intended to prevent, treat, or cure disease conditions and/or affect the structure or function of the body.”
At a glance
What a reviewer notes before reading: findings, citations, the response deadline and what the letter warns of.
- Violations
- 4 findings · 2 issue types
- Cited
- 21 CFR 201.5, 21 CFR 201.100
- Response due
- Not stated in the letter
- FDA asks for
- 4 actions
- Named as possible actions
- Seizure, injunction
- Issued by
- Center for Drug Evaluation and Research
- Published status
- No close-out recorded
AI assisted findings
Model-assisted reading of each issue. Open one to see the FDA text it comes from, and check it against the full letter.
01Production & process controlsWeFun is an unapproved new drug because it contains sildenafil and is intended for drug uses, with no approved application.
Your “WeFun” product is a drug as defined by section 201(g)(1) of the FD&C Act 21, U.S.C. 321(g)(1) because it is intended to prevent, treat, or cure disease conditions and/or affect the structure or function of the body.
02Labeling, claims & marketing · 21 CFR 201.5, 21 CFR 201.100(c)(2)WeFun is misbranded because its labeling lacks adequate directions for use, as it is a prescription drug without an approved application.
Your “WeFun” product is also misbranded under section 502(f)(1) of the FD&C Act, 21 U.S.C. 352(f)(1), in that its labeling fails to bear adequate directions for use.
03Labeling, claims & marketingWeFun is misbranded because its labeling is false or misleading by failing to disclose the presence of a PDE-5 inhibitor.
The labeling for your “We Fun” does not declare that the product contains a PDE-5 inhibitor.
04Labeling, claims & marketingWeFun is misbranded because its labeling lacks adequate warnings for the protection of users.
The undeclared active pharmaceutical ingredient in your product also causes this product to be misbranded under section 502(f)(2) of the FD&C Act, 21 U.S.C. 352(f)(2), because its labeling lacks adequate warnings for the protection of users.
What FDA requested
- explain the specific steps you have taken to address any violations
- include an explanation of each step being taken to prevent the recurrence of violations
- include copies of related documentation
- if you believe the product is not in violation, include your reasoning and any supporting information
FDA Warning Letter
31 paragraphs · 4 sectionsText as published on FDA.gov, retrieved Sep 8, 2026. Layout added for reading; the wording is FDA’s. View on FDA.gov (opens in a new tab)
1Introduction
3 paragraphs
This letter is to advise you that the United States Food and Drug Administration (FDA) reviewed your website at the Internet address, https://www.eshoponlineusa.com, from July to December 2023, where you take orders for “WeFun.”1 In addition, FDA has obtained a sample and labeling of your “WeFun” product. As described below, this product is an unapproved new drug sold in violation of sections 505(a) and 301(d) of the Federal Food, Drug, and Cosmetic Act (FD&C Act), 21 U.S.C. 355(a) and 331(d). Furthermore, your “WeFun” is a misbranded drug under section 502 of the FD&C Act, 21 U.S.C. 352, and sold in violation of section 301(a) of the FD&C Act, 21 U.S.C. 331(a).
FDA confirmed through laboratory analysis that a sample of your “WeFun” product contains the undeclared pharmaceutical ingredient sildenafil. Sildenafil is a phosphodiesterase type-5 (PDE-5) inhibitor and the active ingredient in the FDA-approved prescription drug Viagra used to treat erectile dysfunction (ED). This undeclared ingredient may interact with nitrates found in some prescription drugs, such as nitroglycerin, and may lower blood pressure to dangerous levels. Men with diabetes, high blood pressure, high cholesterol, or heart disease, often take nitrates.
Information on the label and labeling of your “WeFun” product demonstrates that this product is marketed as a dietary supplement. However, under section 201(ff)(3)(B)(i) of the FD&C Act, 21 U.S.C. 321(ff)(3)(B)(i), a dietary supplement may not include an article that is approved as a new drug under section 505 of the FD&C Act unless that article was marketed as a dietary supplement or food before its approval as a drug. FDA approved Viagra (containing sildenafil as the active ingredient) as a new drug on March 27, 1998. Given that sildenafil was not marketed as a dietary supplement or as food before Viagra was approved, your “WeFun” product is excluded from the definition of dietary supplement under section 201(ff)(3)(B)(i) of the FD&C Act, 21 U.S.C. 321(ff)(3)(B)(i).
2Unapproved New Drugs
7 paragraphs
Your “WeFun” product is a drug as defined by section 201(g)(1) of the FD&C Act 21, U.S.C. 321(g)(1) because it is intended to prevent, treat, or cure disease conditions and/or affect the structure or function of the body. Examples of claims observed on your website and product labels that establish the intended use of your “WeFun” product as a drug include, but are not limited to, the following:
On the “WeFun” label:
“ENERGY”
“PERFORMANCE”
On your webpage, https://eshoponlineusa.com/collections/frontpage/products/we-fun-natural-make-energy-supplement-amplifier-for-strength-performance-energy-and-endurance-fast-acting-10-gold-capsules:
“WeFun Natural Male Energy Supplement, Amplifier for Strength, Performance, Energy, and Endurance”
Your “WeFun” product is not generally recognized as safe and effective for its above referenced uses and, therefore, is a “new drug” under section 201(p) of the FD&C Act, 21 U.S.C. 321(p). With certain exceptions not applicable here, a new drug may not be legally introduced or delivered for introduction into interstate commerce without prior approval from the FDA, as described in sections 301(d) and 505(a) of the FD&C Act, 21 U.S.C. 331(d) and 355(a). There is no FDA-approved application in effect for “WeFun.” Introduction or delivery of this product into interstate commerce without an approved application violates sections 505(a) and 301(d) of the FD&C Act, 21 U.S.C. 355(a) and 331(d).
3Misbranded Drug
5 paragraphs
Your “WeFun” product is also misbranded under section 502(f)(1) of the FD&C Act, 21 U.S.C. 352(f)(1), in that its labeling fails to bear adequate directions for use. “Adequate directions for use” means directions under which a layman can use a drug safely and for the purposes for which it is intended (see 21 CFR 201.5). Prescription drugs, as defined in section 503(b)(1) of the FD&C Act, 21 U.S.C. 353(b)(1), include those that, because of their toxicity or other potentiality for harmful effect, and/or the method of their use, and/or the collateral measures necessary for their use, are not safe for use except under supervision of a practitioner licensed by law to administer them. All PDE-5 inhibitors which have been approved for marketing by FDA are limited by an approved new drug application to use under the supervision of a practitioner licensed by law to administer such drugs. Your “WeFun” product, which contains undeclared sildenafil, is a prescription drug as defined in section 503(b)(1)(A) of the FD&C Act, 21 U.S.C. 353(b)(1)(A), and as such, can be used safely only at the direction, and under the supervision, of a licensed practitioner. Therefore, it is impossible to write “adequate directions for use” for your “WeFun” product such that a layperson can use the drug safely for its intended uses. “WeFun” is not exempt from the requirements that its labeling bears adequate directions for use by a layperson, 21 CFR 201.100(c)(2) and 201.115, because there is no FDA approved application in effect for this product. For these reasons, your “WeFun” product is misbranded under section 502(f)(1) of the FD&C Act.
Additionally, your “WeFun” product is misbranded under section 502(a) of the FD&C Act, 21 U.S.C. 352(a). Under section 502(a) of the FD&C Act, 21 U.S.C. 352(a), a drug is misbranded if its labeling is false or misleading in any particular. Section 201(n) of the FD&C Act, 21 U.S.C. 321(n), provides that, in determining whether an article’s labeling or advertising “is misleading there shall be taken into account . . . not only representations made or suggested . . . but also the extent to which the labeling or advertising fails to reveal facts material in light of such representations.” The labeling for your “We Fun” does not declare that the product contains a PDE-5 inhibitor. The use of PDE-5 inhibitors can be associated with significant safety issues and the risk of serious adverse events. The undeclared PDE-5 inhibitor in your “WeFun” product may pose serious health risks because consumers with underlying medical issues may take the product without knowing that it can cause serious harm or interact in dangerous ways with other drugs they may be taking. For example, PDE-5 inhibitors may interact with nitrates found in some prescription drugs (such as nitroglycerin) and can lower blood pressure to dangerous levels. Consumers with diabetes, high blood pressure, or heart disease often take nitrates. The failure to disclose this ingredient in the product labeling renders your “WeFun” product misbranded under section 502(a) of the FD&C Act.
The undeclared active pharmaceutical ingredient in your product also causes this product to be misbranded under section 502(f)(2) of the FD&C Act, 21 U.S.C. 352(f)(2), because its labeling lacks adequate warnings for the protection of users. As previously noted, there is potential for serious health risks associated with this product, particularly since anyone who takes your “WeFun” product would be unaware of the presence of the undeclared drug ingredient and placed at risk for its associated adverse events.
The introduction or delivery for introduction into interstate commerce of this misbranded drug product is a prohibited act under section 301(a) of the FD&C Act, 21 U.S.C. 331(a).
We also documented that your website, https://www.eshoponlineusa.com/, offers for sale variations of “BLACK ANT KING,” “BIGGER LONGER,” “Germany Black Gorilla” and/or various Rhino products for sale to consumers in the United States. Previous FDA lab analyses of products similarly named to those sold on your websites revealed these products contained the undeclared ingredients sildenafil and/or tadalafil.2 We also note that you offer for sale the product “Royal Honey” on your website. A variation of this product with the same name has been the subject of previous FDA warnings after FDA analysis confirmed the presence of an undeclared PDE-5 inhibitor.3 While the Agency has not sampled and tested these product variations from your inventory to date, this letter is to express our serious concern about the safety of these products and emphasize that it is your legal responsibility under federal law to ensure that they do not contain any undeclared and potentially harmful ingredients.
4Conclusion
3 paragraphs
The violations cited in this letter are not intended to be an all-inclusive statement of violations that may exist in connection with the products you distribute. You are responsible for investigating and determining the causes of any violations and for preventing their recurrence or the occurrence of other violations. It is your responsibility to ensure that your firm complies with all requirements of federal law, including FDA regulations.
This letter notifies you of our concerns and provides you an opportunity to address them. Failure to adequately address this matter may result in legal action including, without limitation, seizure and/or injunction. Please submit a written response to this letter within fifteen working days from the date of receipt, explaining the specific steps you have taken to address any violations. Include an explanation of each step being taken to prevent the recurrence of violations, as well as copies of related documentation. If you believe that the product you distribute is not in violation of the FD&C Act, include your reasoning and any supporting information for our consideration within fifteen working days from the date of receipt of this letter.
Your response should be sent to U.S. Food and Drug Administration, Center for Drug Evaluation and Research/Office of Compliance/Office of Unapproved Drugs and Labeling Compliance by e-mail to FDAADVISORY@fda.hhs.gov.
Citations and trends
Each 21 CFR section, ISO 13485 clause and issue type in this letter, how often it appears across all letters, and its trend by the year FDA issued the letters. 2026 runs to Nov 3, 2026, compared with the same dates last year. Select a row or a bar to see those letters in Letters. As cited in this historical letter, not a statement of current requirements.
Regulations
Issue types
Record details
- Issuing center
- Center for Drug Evaluation and Research
- Issuing office
- Center for Drug Evaluation and Research
- Location
- Brooklyn, NY, United States
- Letter posted date
- Dec 26, 2023
- Letter issue date
- Dec 20, 2023
- Addressed to
- Not recorded
- Inspection dates
- Not recorded
- Response window
- Not verified in this snapshot. Consult the original letter.
- Record length
- 1,656 words · 4 recorded redactions
- Published status
- No published close-out
- Original letter
- View on FDA.gov (opens in a new tab)
- Dataset last checked
- Nov 11, 2026 · How this is built
A response window is not a calculated due date. Source excerpts are selected passages. Finding interpretations and categories are model-assisted. Verify the original letter before relying on a finding.