A Pharmacokinetic Study of Single Oral Doses of Six Different Vitamin C Product Forms

NCT06471023 | Completed

• 1 other identifier: T0052
• Study Type: interventional
• Target: 27
• Locations: 1 country
• Sites: 1

Brief Summary

Vitamin C (ascorbic acid) is an essential nutrient linked to many aspects of basic human physiology. It is a potent antioxidant and involved as a cofactor for many human enzymes, and its extreme deficiency can lead to a fatal disease known as scurvy and reduce immune function. Relatively less serious deficiency over a longer period of time may also increase cardiovascular disease and cancer risk. Deficiency is common amongst the Canadian general population, with around 5.5% being found to possess deficient plasma concentrations. Moreover, amongst many industrialized countries, rates of deficiency can be as high as 15% of the general population. Potential vitamin C overdose is not considered to be serious, but symptoms can include nausea, vomiting, headache, rash, and asthenia. The pharmacokinetic profiles of vitamin C supplements are influenced by their formulation, impacting safety and efficacy. The study will compare the PK properties of six different vitamin C formulations, each over a 24 h test period.

Conditions

Healthy; Pharmacokinetic

Keywords

Vitamin C; Ascorbic acid; Pharmacokinetics

Outcome Measures

Primary Outcomes (1)

• Bioavailability of vitamin C compared between each of the liposomal formulations TP1 and TP2 to the traditional RP

  Area under the plasma concentration-time curve over 24 h (AUC0-24) for L-ascorbic acid following single dose administration of TP1 and TP2 and RP.

  0-24 hours

Secondary Outcomes (5)

• Pharmacokinetics (PK) of single doses of six vitamin C formulations

  0-24 hours

• Pharmacokinetics (PK) of single doses of six vitamin C formulations

  0-24 hours

• Bioavailability of vitamin C compared between six different formulations.

  0-24 hours

• Excretion of vitamin C in urine over a 24 h period compared between six different formulations.

  0-24 hours

• Uptake and maintenance of vitamin C in peripheral blood mononuclear cells (PBMCs) between six different formulations.

  0-24 hours

Other Outcomes (38)

• Pharmacokinetics (PK) of single doses of six vitamin C formulations.

  0-24 hours

• Pharmacokinetics (PK) of single doses of six vitamin C formulations.

  0-24 hours

• Pharmacokinetics (PK) of single doses of six vitamin C formulations.

  0-24 hours

Study Arms (3)

TP1 → TP2 → TP3 → TP4 → CP → RP

OTHER

Each test period will consist of 2 in-clinic visits to assess the pharmacokinetics of one of the assigned study products. On Day 1 of each test period participants will provide a pre-dose blood sample within 90-minutes before a dose of study product, followed by PK blood sample collections for the next 10 h. Participants will return to the clinic the following day for the 24 h PK blood sample collection. Each test period will be separated by a washout period.

Dietary Supplement: TP1; Dietary Supplement: TP2; Dietary Supplement: TP3; Dietary Supplement: TP4; Dietary Supplement: CP; Dietary Supplement: RP

RP → TP1 → TP2 → TP3 → TP4 → CP

OTHER

Each test period will consist of 2 in-clinic visits to assess the pharmacokinetics of one of the assigned study products. On Day 1 of each test period participants will provide a pre-dose blood sample within 90-minutes before a dose of study product, followed by PK blood sample collections for the next 10 h. Participants will return to the clinic the following day for the 24 h PK blood sample collection. Each test period will be separated by a washout period.

Dietary Supplement: TP1; Dietary Supplement: TP2; Dietary Supplement: TP3; Dietary Supplement: TP4; Dietary Supplement: CP; Dietary Supplement: RP

CP → RP → TP1 → TP2 → TP3 → TP4

OTHER

Each test period will consist of 2 in-clinic visits to assess the pharmacokinetics of one of the assigned study products. On Day 1 of each test period participants will provide a pre-dose blood sample within 90-minutes before a dose of study product, followed by PK blood sample collections for the next 10 h. Participants will return to the clinic the following day for the 24 h PK blood sample collection. Each test period will be separated by a washout period.

Dietary Supplement: TP1; Dietary Supplement: TP2; Dietary Supplement: TP3; Dietary Supplement: TP4; Dietary Supplement: CP; Dietary Supplement: RP

Interventions

TP1 DIETARY_SUPPLEMENT

Vitamin C formulation 1, 1000 mg

CP → RP → TP1 → TP2 → TP3 → TP4; RP → TP1 → TP2 → TP3 → TP4 → CP; TP1 → TP2 → TP3 → TP4 → CP → RP

TP2 DIETARY_SUPPLEMENT

Vitamin C formulation 2, 1000 mg

CP → RP → TP1 → TP2 → TP3 → TP4; RP → TP1 → TP2 → TP3 → TP4 → CP; TP1 → TP2 → TP3 → TP4 → CP → RP

TP3 DIETARY_SUPPLEMENT

Vitamin C formulation 3, 1000 mg

CP → RP → TP1 → TP2 → TP3 → TP4; RP → TP1 → TP2 → TP3 → TP4 → CP; TP1 → TP2 → TP3 → TP4 → CP → RP

TP4 DIETARY_SUPPLEMENT

regular Vitamin C, 3000 mg

CP → RP → TP1 → TP2 → TP3 → TP4; RP → TP1 → TP2 → TP3 → TP4 → CP; TP1 → TP2 → TP3 → TP4 → CP → RP

CP DIETARY_SUPPLEMENT

Vitamin C formulation 4, 1000 mg

CP → RP → TP1 → TP2 → TP3 → TP4; RP → TP1 → TP2 → TP3 → TP4 → CP; TP1 → TP2 → TP3 → TP4 → CP → RP

RP DIETARY_SUPPLEMENT

regular Vitamin C, 1000 mg

CP → RP → TP1 → TP2 → TP3 → TP4; RP → TP1 → TP2 → TP3 → TP4 → CP; TP1 → TP2 → TP3 → TP4 → CP → RP

Eligibility Criteria

• Age: 18 Years - 55 Years
• Sex: all
• Healthy Volunteers: Yes
• Age Groups: Adult (18-64)

You may qualify if:

• In good general health (i.e., no uncontrolled diseases or conditions) as deemed by the investigator.
• Are able to swallow the study products, in whole.
• Have a body mass index (BMI) between 18.0 to 29.9 kg/m2 (inclusive).
• Must have suitable veins for repeated venipuncture.
• No nicotine and/or nicotine products, including smoking or vaping of any kind (e.g., cigarettes) for at least 3 months before screening.
• Have maintained consistent dietary habits (including supplement intake) and lifestyle for the last 3 months before screening. Participants must be willing to maintain these habits throughout the duration of the study, with the exception of changes required by the vitamin C dietary restrictions.
• Willing to comply with the vitamin C dietary restrictions, 2 weeks prior to the baseline and throughout the duration of the study until the last study visit.
• Agree to follow the restrictions on concomitant treatments as listed in the protocol.
• Agree to follow the restrictions on lifestyle as listed in the protocol.
• Agree to use acceptable contraceptive methods as listed in the protocol.
• Willing and able to agree to the requirements of this study, willing to give voluntary consent, able to understand and read the questionnaires, and carry out all study-related procedures.
• Agrees not to donate blood until 3 months after study completion
• Must weigh ≥ 58.9 kg (130 lbs) at screening

You may not qualify if:

• Individuals who are lactating, pregnant or planning to become pregnant during the study.
• Have a known sensitivity, intolerability, or allergy to any of the study products or their excipients.
• Have Type I diabetes, Type II diabetes, high blood pressure (≥140 systolic or ≥90 diastolic mmHg), or thyroid disease.
• Have medical condition(s) known to interfere with absorption, distribution, metabolism, or excretion of the study product (e.g., Crohn's disease, short bowel, acute or chronic pancreatitis, or pancreatic insufficiency).
• Have a history of heart disease, renal or hepatic impairment/disease, gout, hemochromatosis, glucose-6-phosphate dehydrogenase deficiency, immune disorders and/or immunocompromised (i.e., HIV/AIDS).
• Have a history of cancer (except localized skin cancer without metastases or in situ cervical cancer), unless a minimum of 5 years before the screening visit have elapsed since full recovery.
• Reports a clinically significant illness during the 28 days before the first dose of study product, including acute inflammatory conditions or viral infections (e.g., cold, flu, COVID-19), or any other condition that, in the opinion of the investigator, may be of a concern for the study.
• Participants must not exceed the ''high'' physical activity level as defined by the International Physical Activity Questionnaire-- Short Form (IPAQ-SF) in the week prior to baseline and agree to adhere to this requirement throughout the study duration. A 'high' physical activity level is defend as having engaged in vigorous-intensity physical activity on at least 3 days achieving a total of 1500 or more Metabolic Equivalent of Task (MET)-minutes per week; or, having engaged in any combination of walking, moderate-intensity, or vigorous-intensity physical activities on 7 or more days achieving a total of 3000 or more MET-minutes per week.
• Reports a significant blood loss or blood donation totaling between 101 mL to 449 mL of blood within 30 days prior to the first PK visit or a blood donation of more than 450 mL within 3 months prior to the first PK visit.
• Major surgery in 3 months before screening or planned major surgery during the study.
• Are receiving treatments for or have been hospitalized in the last 12 months for psychiatric disorders (e.g., depression, bipolar disorder, schizophrenia, etc.).
• Demonstrates a positive urine drug screen for compounds listed in the protocol, or positive breath alcohol test at screening or baseline.
• Have a history of alcohol or substance abuse in the 12 months before screening (including having been hospitalized for such in an in-patient or out-patient intervention program).
• Currently consumes, on average, more than 2 standard alcoholic beverages a day or has any habit of alcohol use that, to the opinion of the investigator, may be of a concern for the study. A standard alcoholic beverage is defined as 12 ounces of beer, 5 ounces of wine, or 1.5 ounces of liquor.
• Current enrolment or past participation in another study with any product(s) with at least one active ingredient within 30 days before first dose of study product (or screening) or longer, if the previous test product is deemed by the investigator to have lasting effects that might influence the eligibility criteria or outcomes of current study.

Sponsors & Collaborators

• DSM Nutritional Products, Inc.: lead
• Nutrasource Pharmaceutical and Nutraceutical Services, Inc.: collaborator

Study Sites (1)

Nutrasource Site (Apex Trials)

Guelph, Ontario, N1G 0B4, Canada

Location

MeSH Terms

Interventions

splenotritin

Study Design

• Study Type: interventional
• Phase: not applicable
• Allocation: RANDOMIZED
• Masking: TRIPLE
• Who Masked: PARTICIPANT, INVESTIGATOR, OUTCOMES ASSESSOR
• Masking Details: An unblinded personnel at the CRO will be responsible for study product labelling/blinding. The study products will subsequently be distributed to the study site. Delegated unblinded site personnel will be responsible for study product accountability, reconciliation, and record maintenance (i.e., receipt, reconciliation, and final disposition records) throughout the course of the study. The investigator will have oversight in a blinded manner.
• Purpose: BASIC SCIENCE
• Intervention Model: CROSSOVER
• Sponsor Type: INDUSTRY
• Responsible Party: SPONSOR

Study Record Dates

• First Submitted: June 12, 2024
• First Posted: June 24, 2024
• Study Start: July 1, 2024
• Primary Completion: September 16, 2024
• Study Completion: September 16, 2024
• Last Updated: January 10, 2025

Record last verified: 2025-01

Locations

CA (1)