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Supplementation Absorption Comparison

Effect of Different Supplement Formulations on Nutrient Absorption in Otherwise Healthy Participants: a Randomised, Parallel-group Study With Double-blinded Omega-3 and Single-blinded Vitamin D3

Status
Recruiting
Phases
Phase 4
Study type
Interventional
Source
ClinicalTrials.gov
Registry ID
NCT07791797
Acronym
PHAABS
Enrollment
160
Registered
2026-08-28
Start date
2026-08-31
Completion date
2027-09-01
Last updated
2026-09-10

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Healthy Volunteer

Keywords

absorption, vitamin D, omega-3

Brief summary

The goal of this interventional study is to compare the absorption of supplements with and without absorption enhancing technology in healthy volunteers. We will be testing vitamin D3 and omega 3 in both males and females 18 years and older. Part A will comprise of two arms receiving a single dose of omega-3 supplement, and two arms who will receive vitamin D3 supplement daily for 7 days. Part B comprises of two arms who will receive vitamin D3 supplement daily for 6 weeks.

Interventions

DIETARY_SUPPLEMENTAquacelle® Omega 3

Participants will consume 1 capsule containing 315mg EPA and DHA

DIETARY_SUPPLEMENTComparator Omega 3

Participants will consume 1 capsule containing 315mg EPA and DHA

DIETARY_SUPPLEMENTPlexosome® Vitamin D3

Participants will have 1000IU vitamin D3 each day for 7 days

DIETARY_SUPPLEMENTComparator Vitamin D3

Participants will have 1000IU vitamin D3 each day for 7 days

DIETARY_SUPPLEMENTPlexosome® Vitamin D3 6 weeks

Participants will have 1000IU vitamin D3 each day for 6 weeks

COMBINATION_PRODUCTComparator Vitamin D3 6 weeks

Participants will have 1000IU vitamin D3 each day for 6 weeks

Sponsors

RDC Clinical Pty Ltd
Lead SponsorINDUSTRY

Study design

Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
OTHER
Masking
QUADRUPLE (Subject, Caregiver, Investigator, Outcomes Assessor)

Masking description

Double-blind omega-3 sub-study and a single-blind vitamin D3 sub-study, with blinded laboratory analysis and blinded statistical analysis

Eligibility

Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
Yes

Inclusion criteria

Part A: Inclusion Criteria: * Adults 18 years and older * Generally healthy * BMI 18.5-29.9 kg/m2 * Able to provide informed consent * Agree to not participate in another clinical trial while enrolled in this trial * Agree not to change current diet and/or exercise frequency or intensity during entire study period * Participant's ability to participate fully and comply with demands of the study including attendance at all scheduled blood collection time points

Exclusion criteria

* Have a serious illness e.g. mood disorders such as depression, anxiety or bipolar disorder, neurological disorders such as MS, kidney disease, liver disease or heart conditions * Have an unstable illness e.g. diabetes and thyroid gland dysfunction * Current malignancy (excluding Basal Cell Carcinoma) or chemotherapy or radiotherapy treatment for malignancy within the previous 2 years * Significant change in diet in the past 1-month (e.g., removal of a food group or calorie restriction) * Active smokers, nicotine use or drug (prescription or illegal substances) abuse * Chronic past and/or current alcohol use (\>21 alcoholic drinks week) * Pregnant or lactating women * Allergic to any of the ingredients in enhanced or standard formula * Participants who are currently participating in any other clinical trial or who have participated in any other clinical trial during the past 1 month (excluding RDC Clinical trials) * Any condition which in the opinion of the investigator makes the participant unsuitable for inclusion * Regular use within the past 4 weeks of supplements containing the trial product Part B: The above criteria apply, plus baseline serum 25(OH)D \<20.0 ng/mL (\<50.0 nm/L)

Design outcomes

Primary

MeasureTime frameDescription
Part A: serum/plasma absorption (AUC) of the trial product t0-t168 (vitamin D3)Baseline to day 7Baseline-corrected values in serum/plasma absorption (AUC) of the trial product t0-t168 (vitamin D3)
Part A: serum/plasma absorption (AUC) of the trial product t0-t24 (omega-3)Baseline to day 2Baseline-corrected values in serum/plasma absorption (AUC) of the trial product t0-t24 (omega-3)
Part B: Baseline-corrected serum 25(OH)D AUC (0-6 weeks)Baseline to 6 weeksBaseline-corrected serum 25(OH)D AUC (0-6 weeks)

Secondary

MeasureTime frameDescription
Part A: Serum/plasma absorption (AUC) of the trial product t0-t8 (vitamin D3)Baseline to 8 hoursSerum/plasma absorption (AUC) of the trial product t0-t8 (vitamin D3)
Part A: serum/plasma absorption (AUC) of the trial product t0-t24 (vitamin D3)Baseline to day 2serum/plasma absorption (AUC) of the trial product t0-t24 (vitamin D3)
Part A: Serum/plasma absorption (AUC) of the trial product t0-t48 (vitamin D3)Baseline to day 3Serum/plasma absorption (AUC) of the trial product t0-t48 (vitamin D3)
Part A: Serum/plasma absorption (AUC) of the trial product t0-t10 (omega-3)Baseline to 10hoursSerum/plasma absorption (AUC) of the trial product t0-t10 (omega-3)
Part A: Change and absolute Tmax (vitamin D)Baseline to day 7Change and absolute Tmax
Part A: Change and absolute Cmax (vitamin D)Baseline to day 7Change and absolute Cmax
Part A: Change and absolute Tmax (omega-3)Baseline to day 2Change and absolute Tmax
Part A: Change and absolute Cmax (omega-3)Baseline to day 2Change and absolute Cmax
Part A: Participant demographicsBaselineParticipant demographics
Part A: TolerabilityBaseline to day 7Tolerability
Part A: Safety via AE monitoringBaseline to day 7Safety via AE monitoring
Part B: Change from baseline at week 6, standard vs enhanced formulationBaseline to week 6Change from baseline at week 6, standard vs enhanced formulation
Part B: Weekly 25(OH)D changeBaseline to week 6Weekly 25(OH)D change
Part B: Weekly cholecalciferol changeBaseline to week 6Weekly cholecalciferol change
Part B: DemographicsBaselineDemographics
Part B: TolerabilityBaseline to week 6Tolerability
Part B: Safety (E/LFT)Baseline to week 6Safety (E/LFT)

Countries

Australia

Contacts

CONTACTDavid Briskey
research@rdcglobal.com.au+61(0)731024486
PRINCIPAL_INVESTIGATORDavid Briskey

RDC Clinical

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Sep 11, 2026